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Forgetting

Forgetting is the progressive decline in the accessibility of previously encoded and stored information in long-term memory, manifesting as a failure of retrieval rather than permanent erasure in most cases.^[1]^[2] This phenomenon, empirically quantified by Hermann Ebbinghaus in 1885 through self-experiments on nonsense syllables, follows an exponential pattern where retention drops sharply within hours—often to below 50%—before leveling off, a trajectory replicated in modern studies using the method of savings.^[3]^[4] Forgetting is not merely a defect but an adaptive mechanism that filters irrelevant details, enabling efficient prioritization of salient knowledge amid continuous sensory input, though pathological excesses link to conditions like depression or sleep deprivation.^[5]^[6] Key explanatory theories emphasize causal factors such as trace decay, where unused memory representations weaken passively over time, and interference, where new learning disrupts old traces (retroactive) or vice versa (proactive), supported by controlled interference paradigms showing reduced recall under competing stimuli.^[7]^[8] Retrieval failures, often context-dependent, further account for apparent losses resolvable by cues, underscoring that much "forgotten" content persists latently rather than decaying irretrievably.^[9] Controversies persist in distinguishing true decay from interference dominance, with empirical evidence favoring the latter in long-term scenarios, challenging intuitive notions of passive erosion.^[10]^[11]

Fundamentals

Definition and Scope

Forgetting is defined in psychology as the inability to retrieve or recall information that has been previously learned and stored in memory, rather than a failure of initial encoding or permanent erasure of the trace.^[12] This distinction emphasizes that the information may persist in a latent form but becomes inaccessible due to factors such as time, interference, or contextual mismatches, as evidenced by retrieval failures in experimental settings where cues restore access.^[2] Empirical studies, including those using paired-associate learning tasks, consistently show forgetting as a measurable decline in recall probability, often modeled mathematically to predict retention rates.^[13] The scope of forgetting encompasses both short-term and long-term memory processes across species, from simple habituation in invertebrates to complex episodic recall in humans, serving as a core component of cognitive efficiency rather than mere dysfunction.^[14] In cognitive science, it is delineated from pathological conditions like amnesia, which involve profound, often neurologically induced disruptions, by focusing on adaptive, everyday occurrences quantified in laboratory paradigms such as free recall or recognition tests.^[15] Pioneering work by Hermann Ebbinghaus in 1885 established its quantifiability through the forgetting curve, depicting an initial rapid decay—reaching about 58% retention after 20 minutes and 21% after 24 hours for nonsense syllables—followed by asymptotic stabilization, highlighting forgetting's predictability under minimal rehearsal conditions.^[16] This scope excludes deliberate suppression or motivated forgetting, which involve active cognitive control, but includes passive mechanisms like trace decay or retroactive interference, as supported by longitudinal tracking of memory performance in controlled cohorts.^[7] Forgetting's study integrates interdisciplinary evidence from behavioral experiments, neuroimaging, and computational models, revealing it as an evolved process that prevents informational overload by pruning low-utility traces, with retention half-lives varying by material salience and repetition frequency.^[17]

Types of Forgetting

Passive forgetting encompasses spontaneous loss of memory traces over time or due to competing information, as opposed to deliberate erasure. Decay theory posits that memories weaken and fade automatically as a function of time since encoding, independent of intervening events, supported by experiments showing steeper forgetting curves in the absence of interference, such as in isolated visual long-term memory tasks where detail retention declined over delays without new stimuli.^[18] Interference theory, conversely, attributes forgetting to the disruptive effects of similar memories, divided into proactive interference—where prior learning impairs recall of new material—and retroactive interference, where subsequent learning overwrites or competes with established traces; empirical evidence from paired-associate learning paradigms demonstrates that introducing similar items post-encoding reduces recall accuracy by up to 50% compared to dissimilar fillers.^[19] These passive mechanisms explain much of everyday forgetting, with studies indicating interference accounts for the majority of short-term memory loss in controlled intervals, though pure decay remains challenging to isolate due to inevitable cognitive activity.^[20] Active forgetting involves intentional or incidental processes that suppress or inhibit memory access, often serving adaptive functions like updating knowledge or reducing cognitive load. Directed forgetting, studied via item-method paradigms, occurs when cues instruct participants to forget specific items, leading to 20-30% reduced recall for forget-cued material through prefrontal cortex-mediated inhibition, as evidenced by fMRI showing heightened dorsolateral prefrontal activity during suppression tasks.^[21] Retrieval-induced forgetting, an unintentional variant, arises when retrieving one memory impairs related but unpracticed ones via inhibitory competition, with experiments revealing up to 15% forgetting of competitors after selective practice sessions, a process linked to right prefrontal mechanisms that generalize beyond the lab to real-world scenarios like eyewitness testimony distortions.^[22] Motivated forgetting extends this to emotional contexts, where prefrontal-limbic interactions suppress unwanted traces, such as in think/no-think tasks where repeated suppression reduces hippocampal activation and behavioral recall by 10-20%, though long-term efficacy varies and may not erase underlying engrams.^[23] Other classifications include context-dependent forgetting, where recall fails due to mismatches in environmental or internal cues at encoding and retrieval, as shown in cue-dependent experiments yielding 40% better performance in reinstatement conditions; and recognition-induced forgetting, where accessing a probe impairs semantically related items through lateral inhibition, distinct from pure interference by its selectivity in long-term stores.^[24] Empirical distinctions emphasize that most forgetting reflects retrieval failure rather than permanent erasure, with neural evidence from animal models indicating active destabilization of engrams via synaptic pruning in the hippocampus, challenging purely passive decay models.^[1]^[25] These types are not mutually exclusive, often interacting; for instance, interference can amplify decay-like effects in dynamic neural circuits.^[26]

Evolutionary and Adaptive Foundations

Biological Necessity

Forgetting constitutes a fundamental biological imperative due to the finite capacity of neural resources in the brain, which cannot indefinitely store all encountered information without compromising efficiency and adaptability. Synaptic connections and engrams, the physical traces of memories, demand substantial energetic and structural maintenance; unchecked accumulation would lead to resource depletion and interference among traces, hindering the prioritization of salient data for survival-relevant decisions. Empirical studies demonstrate that the brain's default state favors forgetting as a protective mechanism against overload, with active processes eroding irrelevant traces to preserve operational bandwidth.^[27]^[28]^[29] This necessity manifests in the promotion of synaptic plasticity, where forgetting facilitates the pruning of obsolete connections to enable learning and behavioral flexibility in dynamic environments. Neurogenesis in the hippocampus, for instance, actively destabilizes older memories to integrate novel experiences, preventing rigidity that could impair adaptation to new threats or opportunities. Without such erasure, excessive retention would engender catastrophic interference, as evidenced by computational models and animal studies showing that hyper-stable memories reduce generalization and predictive accuracy.^[30]^[31]^[25] Evolutionarily, forgetting aligns with causal pressures for efficiency, as organisms retaining all details would incur metabolic costs outweighing benefits in ancestral contexts of scarcity and variability. Mechanisms like intrinsic forgetting—mediated by proteins such as Rac—compete with memory consolidation pathways, ensuring only fitness-enhancing information persists while discarding noise, thereby optimizing decision-making under uncertainty. Disruptions in these processes, observed in model organisms with genetically suppressed forgetting, yield diminished exploratory behavior and maladaptive fixation on outdated cues, underscoring forgetting's role in sustaining viable neural economies.^[32]30498-1.pdf)^[33]

Survival and Efficiency Benefits

Forgetting enables adaptive updating of knowledge in dynamic environments, a process critical for survival in ancestral human societies. Hunter-gatherers, facing fluctuating resources and threats, benefited from mechanisms that prioritize recent, relevant information over obsolete memories, such as discarded migration patterns of prey or neutralized environmental hazards. ^[34] ^[32] This evolutionary adaptation aligns with causal pressures for behavioral flexibility, where rigid retention of outdated data could lead to maladaptive decisions, reducing reproductive fitness. ^[29] Empirical models suggest forgetting evolved sensitivity to contextual relevance, favoring retention of fitness-linked details while suppressing interference from prior, less pertinent experiences. ^[32] Beyond individual survival, forgetting supports group cohesion, essential for cooperative species like humans. By attenuating memories of minor interpersonal conflicts or slights, it mitigates chronic grudges that could disrupt alliances vital for hunting, defense, or child-rearing. ^[32] Neuroscientific evidence indicates active forgetting, such as interference-based suppression, facilitates emotional recovery from stressors, redirecting cognitive resources toward prospective threats rather than ruminative fixation on past events. ^[13] ^[35] In experimental paradigms, survival-oriented processing enhances retention of adaptive items while permitting directed forgetting of irrelevant ones, underscoring how selective amnesia bolsters overall mnemonic prioritization under resource scarcity. ^[36] Cognitively, forgetting enhances efficiency by alleviating interference and preventing overload in finite neural systems. Without decay of unused traces, retrieval would slow due to competition among engrams, impairing rapid decision-making in high-stakes scenarios like predator evasion. ^[37] ^[29] Studies on working memory demonstrate that cues inducing forgetting improve the fidelity of retained representations, reducing noise and elevating signal quality for task-critical information. ^[38] This pruning effect, observed in synaptic weakening and neurogenesis-driven erasure, optimizes computational resources, particularly under cognitive load, where unfiltered recall would exacerbate errors or delays. ^[13] ^[39] In aging populations, such mechanisms prove especially valuable, countering accumulation of trivia that burdens executive functions and sustains performance. ^[39]

Historical Context

Early Philosophical and Empirical Insights

Ancient Greek philosophers provided foundational insights into forgetting as a counterpart to memory. Plato, in the Phaedrus (c. 370 BCE), critiqued the invention of writing through the myth of Theuth, arguing that it would produce forgetfulness in learners by diminishing the exercise of memory, as individuals would rely on external records rather than internal retention.^[40] This view positioned forgetting not merely as passive loss but as an active consequence of substituting artificial aids for natural mnemonic effort. Aristotle, in On Memory and Reminiscence (c. 350 BCE), differentiated memory from immediate perception and knowledge, describing it as a state involving the lingering affection of sensory images in the soul.^[41] He implied forgetting arises from the failure to retrieve these past images through association or reminiscence, a process akin to searching for a lost object via connected traces, rather than inevitable decay.^[42] These philosophical treatments emphasized forgetting's role in human cognition, often linking it to ethical or epistemological concerns, such as the reliability of recollection for pursuing truth. Plato's theory of anamnesis further framed forgetting as a veil over pre-existing knowledge from the soul's immortal state, requiring dialectical effort to overcome.^[42] Aristotle extended this by outlining reminiscence as an active inference from present images to past ones, suggesting forgetting could stem from weak associative chains or distracting impressions, prefiguring later interference concepts.^[43] Such ideas influenced subsequent thinkers, including Roman Stoics, who integrated memory and forgetting into broader accounts of rational control over impressions. The transition to empirical inquiry occurred in the 19th century with Hermann Ebbinghaus's self-experiments, detailed in Über das Gedächtnis (1885). Using nonsense syllables to isolate pure memory effects from meaning, Ebbinghaus quantified forgetting by measuring relearning savings after intervals, revealing a rapid initial decline in retention followed by stabilization—described mathematically as retention ≈ 100% × (time elapsed)^(-k), where k ≈ 0.6 for short lists without prior repetitions.^[44] This "forgetting curve" demonstrated forgetting's non-linear, time-dependent nature under controlled conditions, challenging anecdotal views and establishing experimental psychology's foundations, though limited by reliance on verbal material and individual data.^[45] Ebbinghaus also noted that spaced repetitions mitigated forgetting, providing early evidence for distributed practice's efficacy in retention.^[46] These insights shifted discourse from speculative philosophy to measurable phenomena, influencing 20th-century research while highlighting variables like material familiarity absent in his paradigm.

Key Milestones in 20th-21st Century Research

In 1924, John G. Jenkins and Karl M. Dallenbach published findings from experiments showing that the rate of forgetting nonsense syllables was significantly slower during sleep than during waking hours, attributing this to reduced interference from external stimuli rather than spontaneous decay over time.^[47] Their work challenged pure time-based decay models and emphasized environmental interference as a key driver of forgetting.^[47] The 1959 study by Lloyd R. Peterson and Margaret Jean Peterson demonstrated rapid decay in short-term retention of verbal items, with recall dropping to near zero after 18 seconds when rehearsal was blocked by a distractor task involving serial addition of three-digit numbers.^[48] This supported trace decay as a mechanism in short-term memory under conditions minimizing proactive and retroactive interference.^[48] Directed forgetting paradigms emerged in the mid-1960s, with William S. Muther's 1965 experiment providing the first demonstration of item-method directed forgetting using words, where instructions to forget specific items reduced their later recall compared to to-be-remembered items.^[49] Robert A. Bjork advanced this in 1970 by showing "positive forgetting," where intentionally forgetting items decreased their interference on subsequent recall of other material, highlighting voluntary control over memory traces.^[50] Retrieval-induced forgetting was formalized in 1994 by Michael C. Anderson, Robert A. Bjork, and Elizabeth L. Bjork, who found that selectively practicing retrieval of category exemplars (e.g., fruit-apple) impaired recall of related unpracticed exemplars (e.g., fruit-orange), evidence for inhibitory processes suppressing competing memories during retrieval.^[51] In the 21st century, neuroscience research identified active forgetting mechanisms, including neurogenesis-driven erasure of old engrams in the hippocampus (e.g., via new neuron integration overwriting prior traces) and intrinsic synaptic destabilization, as reviewed in 2017 syntheses of rodent and human studies.^[13] Bjork's framework of desirable difficulties, refined through the 2000s, posited that inducing forgetting via spaced retrieval or varied practice strengthens long-term storage by enhancing retrieval strength relative to temporary access ease.^[52] A 2015 replication of Ebbinghaus's forgetting curve using modern methods confirmed exponential retention loss without reinforcement, underscoring enduring empirical patterns amid theoretical evolution.^[3]

Neural and Physiological Mechanisms

Brain Regions and Processes

The hippocampus plays a central role in both memory formation and active forgetting, where mechanisms such as synaptic pruning by microglia eliminate unnecessary synaptic connections to refine memory traces. Studies in adult mice demonstrate that microglia-mediated phagocytosis targets complement-tagged synapses in the hippocampus, reducing spine density and facilitating forgetting of remote fear memories, with depletion of microglia impairing this process. Additionally, hippocampal neurogenesis contributes to forgetting by introducing new neurons that disrupt existing engrams through pattern separation and interference, as evidenced by enhanced memory retention in models with suppressed adult neurogenesis. Long-term depression (LTD) in hippocampal circuits weakens synaptic efficacy, counterbalancing long-term potentiation (LTP) to enable adaptive forgetting, particularly during sleep-like states where replay consolidates relevant connections while pruning others.^[53]^[13]^[54] The prefrontal cortex (PFC), particularly the dorsolateral and lateral regions, mediates directed and motivated forgetting through top-down inhibitory control, suppressing retrieval of unwanted memories by reducing hippocampal and cortical activation. Functional imaging and lesion studies show that right dorsolateral PFC activity increases during intentional forgetting tasks, with transcranial direct current stimulation to lateral PFC enhancing selective forgetting of specific items while sparing others. This process involves executive functions that inhibit rehearsal and retrieval, as frontal patients exhibit deficits in directed forgetting paradigms, underscoring the PFC's role in cognitive control over episodic memory. Engram competition within PFC-hippocampal circuits further drives forgetting, where overlapping engrams vie for expression, leading to weakened activation of latent traces without permanent erasure.^[55]^[56]^[21] Other regions, including the right superior frontal gyrus and inferior parietal lobe, converge in networks supporting intentional forgetting, with electrophysiological evidence linking their activity to attentional inhibition during forget cues. Molecular pathways across these areas, such as AMPA receptor trafficking and modulation of neural transporters, underlie intrinsic forgetting by destabilizing engrams, as observed in hippocampal modifications that correlate with memory decay. These region-specific processes highlight forgetting as an active, adaptive neural computation rather than mere passive decay, enabling prioritization of salient information amid interference.^[15]^[57]^[30]

Molecular and Cellular Forgetting Pathways

Active forgetting at the molecular and cellular levels encompasses processes that destabilize or eliminate synaptic connections associated with memories, distinct from passive decay. These mechanisms include synaptic depotentiation, receptor trafficking alterations, and phagocytic pruning, often requiring specific signaling cascades to weaken engram stability over time.^[25]^[58] In mammalian models, time-dependent forgetting of long-term memories relies on NMDA receptor activation, particularly GluN2B subunits, which trigger calcium influx through L-type voltage-dependent calcium channels, subsequently activating calcineurin phosphatase. This pathway promotes depotentiation by facilitating the removal of AMPA receptors (GluA2 subunits) from synaptic membranes in hippocampal neurons, as demonstrated in rat object recognition and location tasks where antagonists like memantine or MK-801 extended memory retention up to 10 days post-training.^[58] Calcineurin-mediated dephosphorylation opposes consolidation signals, enabling synaptic weakening essential for forgetting.^[58]^[25] Microglia contribute to forgetting through complement-dependent synaptic elimination in the adult hippocampus, tagging weak synapses for phagocytosis via C1q and C3 proteins, which opsonize presynaptic terminals connected to engram cells. In mouse contextual fear conditioning experiments, depleting microglia or inhibiting their phagocytic activity preserved remote memory engrams by preventing dissociation of engram cell connectivity, while overexpressing the complement inhibitor CD55 in engram neurons similarly blocked forgetting.^[53] This process operates independently of neurogenesis and supports the erasure of juvenile or older memories by refining circuit sparsity.^[53] Adult neurogenesis in the dentate gyrus modulates forgetting by incorporating new granule cells that disrupt existing hippocampal engrams through heightened synaptic competition and plasticity. Ablating neurogenesis in mice impairs the natural decay of contextual fear memories over weeks, indicating that newborn neurons actively overwrite or interfere with consolidated traces via enhanced excitatory inputs.^[25] Invertebrate models reveal conserved dopamine-dependent pathways; in Drosophila, the memory suppressor gene sickie in specific dopamine neurons promotes active forgetting of consolidated memories via Rac1 and Cdc42 signaling, which remodels actin cytoskeleton in mushroom body Kenyon cells, leading to synaptic destabilization within hours to days.^[25] These mechanisms highlight a core role for neuromodulatory and cytoskeletal dynamics in cellular forgetting across species.^[25]

Theoretical Frameworks

Passive Forgetting Mechanisms

Passive forgetting mechanisms refer to the spontaneous decline in memory accessibility over time, independent of deliberate suppression or external interference. These processes primarily involve the gradual weakening or dismantling of neural memory traces through biological entropy, such as molecular turnover and synaptic destabilization, without requiring active neural effort to erase information.^[59] In contrast to active forgetting, which engages targeted neural circuits for suppression, passive mechanisms operate as a default outcome of disuse, ensuring that infrequently accessed memories fade to free cognitive resources.^[60] A foundational explanation is the trace decay theory, which posits that memory representations erode automatically as a function of elapsed time unless reinforced by rehearsal or retrieval. This theory, rooted in early experimental psychology, suggests that the physical substrate of memories—such as synaptic connections—undergoes natural degradation due to processes like protein catabolism and homeostatic synaptic scaling.^[61] For instance, in short-term memory tasks, time-based forgetting has been isolated from interference effects, with evidence indicating that visual memory traces decay proportionally to retention intervals, even under controlled conditions minimizing distraction.^[62] At the molecular level, passive forgetting manifests through ubiquitin-proteasome system activity, which breaks down synaptic proteins essential for engram stability, leading to a probabilistic loss of memory specificity. Dopamine signaling modulates this process; impairments in dopamine pathways, as observed in certain pharmacological models, accelerate passive decay by disrupting the maintenance of trace integrity.^[60] Neuroimaging and electrophysiological studies further corroborate this by showing reduced hippocampal and cortical activity for unrehearsed items over delays, reflecting weakened engram connectivity rather than complete erasure.^[63] Empirical quantification of passive forgetting often relies on the Ebbinghaus forgetting curve, which demonstrates exponential memory loss following initial learning, with retention dropping to approximately 20-30% after 24 hours without review in verbal nonsense syllable tasks. While interference can confound pure decay in naturalistic settings, laboratory paradigms isolating time as the variable—such as delayed matching-to-sample tests—support decay as a distinct causal factor, particularly for declarative and perceptual memories.^[61] These mechanisms underscore forgetting's role in neural efficiency, though contemporary research notes their interplay with subtle active processes at synaptic junctions.^[59]

Active Forgetting Processes

Active forgetting refers to deliberate neural processes that suppress, destabilize, or eliminate memory traces, distinct from passive decay due to disuse. These mechanisms enable adaptive memory updating by prioritizing relevant information and reducing interference from obsolete or intrusive memories.^[25]^[28] In laboratory settings, directed forgetting paradigms demonstrate active suppression, where participants receive cues to forget specific items after initial encoding, leading to reduced recall compared to non-cued items. For instance, in item-method directed forgetting, a "forget" cue prompts intentional disregard of prior material, resulting in 20-30% lower retrieval rates, as evidenced by fMRI studies showing prefrontal activation during cue processing.^[24]^[64] List-method variants, where entire lists are targeted for forgetting, further confirm context-dependent erasure, with electrophysiological data indicating suppressed hippocampal theta rhythms.^[65] Prefrontal cortex exerts top-down inhibitory control as a primary neural substrate, particularly the right dorsolateral prefrontal cortex (dlPFC), which modulates hippocampal and amygdalar activity to gate retrieval. Transcranial magnetic stimulation (TMS) disrupting right dlPFC function impairs forgetting success by 15-25% in think/no-think tasks, underscoring causal involvement.^[66]^[21] Dopaminergic modulation via D1 receptors in prefrontal regions facilitates this inhibition, with pharmacological blockade eliminating incidental forgetting in rodent models.^[30] At cellular and molecular levels, active forgetting involves synaptic pruning and long-term depression (LTD), where microglia tag weak synapses for elimination via complement-dependent phagocytosis, erasing engram connections in the hippocampus. In Drosophila studies, the dopamine receptor Rutabaga drives active destabilization of olfactory memories through cyclic AMP signaling, mirroring mammalian intrinsic forgetting pathways. Neurogenesis in the dentate gyrus similarly overwrites established traces, as optogenetic silencing of adult-born neurons restores remote fear memories in mice. These processes counterbalance consolidation, preventing neural overload, though dysregulation links to disorders like PTSD where suppression fails.^[53]^[28]^[25]

Empirical Criticisms and Alternative Views

Empirical investigations have cast doubt on the trace decay theory, which posits that memories fade passively due to the passage of time, as laboratory and field studies demonstrate that memory traces remain stable over extended periods when interference is minimized or retrieval cues are provided. For example, analyses of long-term retention data reveal that empirical forgetting curves, often modeled as power or exponential functions following Ebbinghaus's early work, underestimate actual retention rates because repeated testing during experiments induces additional forgetting, distorting observed decay.^[67]^[68] Critics of interference-based accounts argue that while proactive and retroactive interference explain competition among traces in controlled settings, they fail to account for spontaneous forgetting of isolated memories without competing items, suggesting additional processes or overreliance on artificial lab paradigms that do not mirror naturalistic encoding and retrieval. In the domain of active forgetting, such as retrieval-induced forgetting, inhibition theory faces challenges from competition-based alternatives, with reviewers noting that inhibitory effects may confound output interference or blocking during testing, rather than reflecting a dedicated neural suppression mechanism independent of contextual demands.^[69]^[70] Alternative perspectives emphasize retrieval failure over trace erasure, asserting that most instances of forgetting stem from inadequate cues or contextual mismatches, allowing dormant traces to persist and become accessible with appropriate prompts, as evidenced by neuroimaging and behavioral recovery in cue-reinstated paradigms. Neuroscientific engram research further supports this by showing that "forgotten" fear memories in rodents can be reinstated via optogenetic stimulation of sparse hippocampal ensembles, implying that forgetting often involves weakened access pathways rather than degradation of the underlying representation. In debates over motivated forgetting, such as in recovered memory controversies, cognitive neuroscience analyses question dissociative repression models due to insufficient evidence for verifiable amnesia, attributing apparent lapses to reconstructive distortions, suggestibility, and normal encoding variability rather than active exclusion from consciousness.^[1]^[71]

Measurement and Experimental Methods

Recall-Based Assessments

Recall-based assessments measure forgetting by evaluating the retrieval of previously learned information from long-term memory, typically without external aids or with limited cues, at varying retention intervals to quantify decay in accessibility. These methods contrast with recognition tasks by demanding active generation of memory traces, providing a direct index of retrieval strength and susceptibility to interference or decay. In experimental designs, participants study material—such as word lists, narratives, or paired associates—and undergo recall tests immediately after learning and after delays ranging from minutes to weeks, with performance drops attributed to forgetting processes like trace decay or retroactive interference.^[72] Free recall, a primary variant, requires participants to retrieve items in any order without prompts, simulating unaided episodic memory access and revealing forgetting through reduced output over time. Studies show free recall performance declines rapidly in the first hours post-learning, stabilizing thereafter, as seen in verbal list paradigms where initial recall exceeds 70% but drops below 20% after a week. This method's sensitivity to temporal gradients makes it suitable for plotting Ebbinghaus-inspired forgetting curves, though it can underestimate retention due to search inefficiencies in memory space. Cued recall modifies this by providing partial retrieval cues (e.g., category names or associates), which boost performance relative to free recall but may mask pure decay by facilitating generate-recognize strategies; research indicates cued recall yields higher hit rates yet remains vulnerable to cue overload, where excessive cues paradoxically impair output compared to free recall.^[73]^[74]^[75] In clinical and longitudinal contexts, recall-based tests assess pathological forgetting, such as accelerated long-term decay in epilepsy or mild cognitive impairment, using delayed free or cued recall of prose passages or word lists. For instance, a 10-word free recall task distinguishes healthy cognition from impairment with high sensitivity, scoring below 6/10 on delayed trials as indicative of decay beyond normal aging. Reliability stems from verbal recall's correlation with hippocampal integrity and its resistance to floor effects in early decline, though variability arises from individual differences in retrieval strategies or testing effects, where prior recalls reduce subsequent forgetting. Critics note that recall metrics conflate encoding, storage, and retrieval deficits, necessitating controls like multiple trials for baseline savings.^[76]^[77]^[78]

Recognition and Relearning Approaches

Recognition approaches evaluate forgetting by testing the ability to identify previously encountered stimuli amid novel distractors following a retention interval. In yes/no paradigms, participants judge each item as "old" or "new," while forced-choice formats require selecting targets from alternatives.^[72] Forgetting manifests as reduced discriminability, often analyzed via signal detection theory, where sensitivity (d') is derived from z-transformed hit rates minus false alarm rates to isolate memory strength from decision biases.^[79] These metrics reveal residual retention when recall fails, as recognition benefits from reinstatement cues, making it less prone to variability than free recall.^[72] Studies of accelerated long-term forgetting in temporal lobe epilepsy demonstrate intact immediate recognition but steeper declines over days to weeks, highlighting its utility for subtle deficits.^[80] Relearning approaches quantify forgetting through the "savings score," which measures the efficiency gain in reacquiring material relative to initial learning. Participants first learn to a criterion (e.g., one perfect recitation), undergo a delay, then relearn to the same criterion; savings s = 1 - (relearning trials / original trials).^[81] Developed by Hermann Ebbinghaus in 1885 using nonsense syllables, this method captures latent memory traces, yielding positive savings even after complete recall loss, thus challenging erasure models of forgetting.^[82] Mathematical analyses confirm its robustness, as savings remain invariant to variations in encoding strength or absolute learning times.^[82] In clinical contexts, relearning detects accelerated forgetting where standard tests underperform; for instance, epilepsy patients exhibit diminished savings over extended intervals, indicating impaired consolidation despite normal acquisition.^[83] Compared to recognition, relearning demands active reconstruction, providing a direct gauge of trace decay but requiring controlled conditions to avoid confounds like fatigue.^[72] Both approaches complement recall-based methods, with recognition excelling in sensitivity to weak signals and relearning in precision for residual strength, though ceiling effects in recognition can mask profound long-term loss.^[72]

Advanced Techniques for Long-Term Forgetting

One prominent advanced technique for assessing long-term forgetting is the accelerated long-term forgetting (ALF) paradigm, which evaluates memory decay over extended periods such as days to weeks following initial learning.^[84] In ALF studies, participants encode verbal or visual materials like stories, word lists, or face-name associations, undergo immediate and short-delay recall tests to confirm intact acquisition and short-term retention, and then complete follow-up assessments at intervals of one week or longer to quantify disproportionate forgetting rates.^[72] This method has revealed ALF in clinical populations, such as those with temporal lobe epilepsy, where forgetting accelerates beyond normal age-related decline, often independent of hippocampal volume or seizure frequency.^[85] Retrieval-induced forgetting (RIF) paradigms, adapted for long-term effects, represent another sophisticated approach to both measuring and inducing forgetting through selective retrieval practice.^[86] Participants study category-exemplar pairs (e.g., fruit-apple, fruit-banana), then repeatedly retrieve a subset (e.g., fruit-apple) while ignoring competitors, followed by final tests after delays ranging from hours to one week, during which non-retrieved related items show suppressed recall.^[87] Long-term RIF persists for at least seven days under conditions minimizing further retrieval interference, with effect sizes indicating 10-20% greater forgetting of practiced competitors compared to unpracticed baselines, though it diminishes if recall cues are provided at test.^[88] This technique highlights inhibitory processes akin to those in everyday memory prioritization, where strengthening one trace weakens associative links to others.^[89] Motivated forgetting protocols, such as the think/no-think task, enable experimental induction of long-term suppression via prefrontal inhibitory control.^[63] Here, participants memorize cue-target pairs and, upon cue presentation, either recall (think) or suppress (no-think) the target over multiple trials, leading to reduced hippocampal and neocortical activation for suppressed items; follow-up tests after 24 hours or more demonstrate 15-25% forgetting relative to baseline pairs.^[63] Recent extensions incorporate subliminal cuing, where unconscious presentation of unwanted memories during a post-encoding window—when hippocampal activity is naturally low—triggers forgetting of aversive content without awareness, as evidenced by impaired recognition accuracy in subsequent sessions.^[90] Integration of neuroimaging with these behavioral paradigms provides advanced insights into neural dynamics of long-term forgetting. Functional MRI during extended RIF or suppression tasks reveals heightened sensory cortical processing for to-be-forgotten items, facilitating their destabilization, while prefrontal-hippocampal decoupling correlates with sustained forgetting over weeks.^[91] Remote digital assessments, including app-based story recall or paired-associate tests over one-week intervals, extend ALF to non-laboratory settings, minimizing confounds like practice effects and confirming accelerated decay in community samples with subtle memory impairments.^[92] These multimodal techniques underscore that long-term forgetting often involves active neural reconfiguration rather than mere trace decay, though methodological challenges persist, such as ensuring ecological validity and controlling for retroactive interference.^[93]

Functional Roles and Advantages

Cognitive Prioritization

Forgetting serves as a mechanism for cognitive prioritization by selectively discarding irrelevant or outdated information, thereby enhancing the accessibility and salience of memories aligned with current goals and environmental demands. This process reduces interference from competing traces, allowing limited neural resources—such as those in working memory—to focus on high-value content. Empirical studies demonstrate that active suppression of non-priority items improves subsequent recall accuracy and decision-making efficiency, as measured in directed forgetting paradigms where participants instructed to forget certain stimuli exhibit reduced hippocampal activation for those items while strengthening prefrontal-hippocampal connectivity for retained ones.^[23]^[33] In working memory contexts, prioritization through forgetting operates adaptively by accelerating the decay of low-relevance representations, which prevents overload and preserves representational fidelity for task-critical elements. For instance, experiments using retro-cue paradigms show that directing attention away from distractors induces faster forgetting of their neural traces, measured via EEG and fMRI, leading to sharper behavioral performance on prioritization tasks with error rates dropping by up to 20% when irrelevant items are suppressed.^[94]^[95] This aligns with computational models positing that forgetting heuristics—e.g., based on recency, salience, or goal relevance—evolve to optimize long-term adaptive outcomes, such as quicker adaptation to changing environments over rote retention of trivia.^[32] The benefits extend to higher-order cognition, where forgetting facilitates creativity and problem-solving by pruning associative networks, enabling novel connections among prioritized memories. Neuroimaging evidence indicates that prefrontal inhibitory control during forgetting reduces cognitive load during retrieval, as evidenced by decreased activation in the dorsolateral prefrontal cortex when previously suppressed items no longer compete, supporting faster and more accurate inferences in decision tasks.^[96] However, this prioritization is not infallible; overzealous forgetting can introduce distortions in prioritized memories under distraction, though it generally outperforms uniform retention in dynamic scenarios, per studies tracking memory fidelity over sessions.^[97]^[17]

Emotional Regulation and Decision-Making

Forgetting serves an adaptive function in emotional regulation by enabling the suppression of distressing memories, thereby reducing rumination and facilitating psychological resilience. Experimental evidence demonstrates that directed forgetting techniques, where individuals intentionally suppress retrieval of negative events, diminish the emotional intensity associated with those memories, as measured by reduced amygdala activation and self-reported affect.^[98] This process parallels reconsolidation mechanisms, where repeated suppression weakens memory traces under conditions mimicking natural forgetting cues.^[98] Selective forgetting of negative stimuli has been linked to improved mental health outcomes, countering persistent recall that exacerbates anxiety and depression; for instance, failures in this adaptive forgetting correlate with heightened vulnerability to mood disorders.^[99] Neuroscience research highlights prefrontal cortex involvement in top-down control of hippocampal activity to actively forget interfering emotional content, promoting context attunement toward present-oriented processing rather than past fixation.^[33] Dopamine modulation in the medial prefrontal cortex further supports this by facilitating the erasure of competing emotional memories, which enhances overall adaptive responding to current stressors.^[100] However, emotional salience can constrain intentional forgetting, as highly arousing events resist suppression more than neutral ones, suggesting inherent limits to this regulatory mechanism rooted in evolutionary priorities for threat retention.^[101] In decision-making, forgetting irrelevant or outdated information prevents cognitive overload and biases from prior experiences, allowing prioritization of goal-relevant data. Studies indicate that individuals exhibiting higher rates of normal forgetting demonstrate superior decision quality, as the brain discards non-adaptive details to streamline evaluation of options, evidenced by improved performance in tasks requiring tradeoffs between specificity and generalization.^[17] ^[102] Suppression of episodic memory associations, akin to adaptive forgetting, alters value judgments in reinforcement learning paradigms, reducing interference from maladaptive past contingencies.^[103] This interplay underscores forgetting's role in flexible cognition: by clearing mental resources, it supports creative problem-solving and reduces anchoring to sunk costs or emotional residues, as seen in computational models balancing memory retention with erasure for optimal behavioral adaptation.^[104] Impairments in such forgetting, conversely, lead to perseverative errors, where over-retention of irrelevant details hampers efficient choice under uncertainty.^[17]

Pathological Aspects

Impairments in Neurological Disorders

Accelerated long-term forgetting (ALF), characterized by intact initial encoding and short-term retention followed by disproportionately rapid memory decline over days to weeks, represents a key impairment in forgetting processes within various neurological disorders.^[105] This pattern contrasts with standard memory tests that assess immediate or brief delays, often revealing deficits only through extended assessments.^[106] ALF arises from disruptions in memory consolidation and stabilization mechanisms, potentially linked to hippocampal and neocortical dysfunction, though exact causal pathways vary by disorder.^[107] In Alzheimer's disease, ALF manifests early, even in preclinical stages, with studies showing normal recall at 30 minutes but significant loss by one week post-learning.^[108] This accelerated decline correlates with amyloid deposition and predicts clinical onset, as evidenced by longitudinal data where ALF rates exceeded those in healthy controls by 20-30% over extended intervals.^[109] In mild cognitive impairment, a precursor to Alzheimer's, ALF similarly emerges, with forgetting rates accelerating within hours to days, independent of short-term memory performance.^[110] Temporal lobe epilepsy, particularly when involving mesial structures, frequently exhibits ALF, where patients retain information normally for up to an hour but forget 40-50% more than controls over one to six months.^[111] This impairment persists despite seizure control and standard neuropsychological normality, attributed to subtle hippocampal sclerosis or subclinical seizures disrupting long-term consolidation.^[112] In contrast, idiopathic generalized epilepsy shows minimal ALF, highlighting region-specific vulnerabilities.^[113] Parkinson's disease involves memory deficits including impaired forgetting, with patients demonstrating slower retrieval and higher forgetting rates over delays, linked to dopaminergic depletion and reduced functional connectivity in frontostriatal networks.^[114] Approximately 25% of patients experience mild cognitive impairment with accelerated episodic memory loss, though less pronounced ALF than in Alzheimer's or epilepsy.^[115] Structural changes, such as cortical thinning, further associate with these forgetting impairments, exacerbating daily recall failures.^[116]

Accelerated and Abnormal Forgetting Patterns

Accelerated long-term forgetting (ALF) is characterized by intact initial learning and retention over short delays (typically minutes to hours), followed by disproportionately rapid decline in memory over extended periods such as days or weeks.^[72] This pattern contrasts with standard anterograde amnesia, where deficits appear immediately after acquisition, and is often detected through repeated testing at longer intervals rather than conventional short-delay assessments.^[117] ALF has been documented in clinical populations via tasks involving verbal or visual material, where forgetting rates exceed those of healthy controls by 20-50% over one week, depending on the modality and baseline performance.^[105] In temporal lobe epilepsy, ALF manifests prominently, with patients showing normal recall at 30 minutes but up to 40% greater forgetting after 24 hours or more, linked to subtle hippocampal dysfunction even outside seizure activity.^[117] Studies using story recall or word-list paradigms report this in 60-80% of cases with medial temporal sclerosis, where electroencephalographic abnormalities correlate with the degree of acceleration.^[92] Similarly, in transient epileptic amnesia—a subtype involving brief amnestic episodes—forgetting accelerates within 3-8 hours post-learning, persisting over weeks despite preserved immediate memory.^[118] Neurodegenerative conditions exhibit ALF as an early marker; in presymptomatic carriers of autosomal dominant Alzheimer's disease mutations, forgetting rates increase by 25-30% over one week compared to non-carriers, preceding standard cognitive impairments by years.^[119] Amyloid-beta deposition, measured via PET imaging, associates with this pattern in mild cognitive impairment, where short-term retention remains above 80% but drops below 50% at extended delays.^[120] In acquired brain injuries without epilepsy, such as traumatic cases, selective acceleration occurs for pictorial material, with patients forgetting 35% more than controls over 24 hours, attributed to disrupted consolidation pathways.^[121] Pediatric epilepsy cohorts reveal ALF in 50% of children with temporal lobe involvement, using face-name association tasks showing normal 10-minute retention but 15-20% excess loss after three days.^[122] This pattern extends to non-epileptic neurology, including genetic risk for frontotemporal dementia, though less consistently, highlighting ALF's sensitivity to medial temporal and prefrontal disruptions over diffuse cortical atrophy.^[123] Overall, ALF underscores a dissociation in memory stages, where encoding succeeds but stabilization fails, often preceding overt pathology and aiding early diagnosis when standard tests underdetect deficits.^[107]

Exceptional Memory Retention

Cases of Minimal Forgetting

Highly Superior Autobiographical Memory (HSAM), a rare neurocognitive trait, exemplifies minimal forgetting through the persistent, detailed retention of personal life events spanning decades, often without the typical decay observed in ordinary memory. Individuals with HSAM can retrieve specific episodic details—such as weather, emotions, and sensory experiences—tied to arbitrary dates, demonstrating resistance to the normal forgetting curve that affects autobiographical recall in the general population.^[124]^[125] This condition, distinct from trained mnemonic techniques, involves involuntary, highly accurate retrieval that bypasses age-related decline in episodic memory.^[126] The first documented case, identified in 2006 by researchers at the University of California, Irvine, involved a woman known initially as "AJ" (later revealed as Jill Price), who exhibited hyperthymestic recall of daily events from February 5, 1980, onward. Price could specify the day of the week for any date in this period and recount associated personal activities with verifiable precision, confirmed through diary comparisons and public records, indicating near-complete retention without rehearsal.^[127]^[128] Subsequent neuroimaging revealed structural differences, such as enhanced connectivity in memory-related networks, supporting the minimal degradation of these traces over time.^[129] Actress Marilu Henner represents another verified HSAM case, capable of recalling minutiae from her life since early childhood, including events from 1952 onward, with accuracy validated against historical facts and personal records. Henner, among fewer than 100 confirmed individuals worldwide as of 2024, demonstrates this through public demonstrations and controlled tests, where she retrieves details like exact locations and conversations from decades prior without cues.^[130]^[131] Research on HSAM cohorts, including Henner, shows superior performance on autobiographical recall tasks compared to controls, with retention rates exceeding 90% for dated events up to 30 years old, though semantic and working memory remain comparable to average levels.^[132] As of 2024, approximately 62 to 100 HSAM cases have been rigorously studied, primarily through behavioral assays and fMRI, revealing consistent patterns of minimal forgetting for episodic details but vulnerability to implanted false memories under suggestion, underscoring that retention does not equate to infallibility.^[133]^[125] A 2025 case study of a 17-year-old female further illustrates developmental onset, with effortless recall of school days and personal milestones from age 5, verified against family corroboration, suggesting genetic or early neural factors in sustaining trace stability.^[134] These instances highlight HSAM as a natural counterpoint to normative forgetting, where encoded experiences persist vividly, informing models of memory consolidation.^[135]

Consequences of Impaired Forgetting

Impaired forgetting, as observed in conditions like highly superior autobiographical memory (HSAM), results in the persistent retention of vast autobiographical details, often spanning decades, without the adaptive filtering typical of normal memory processes.^[136] This leads to an overload of recalled events, including mundane and negative experiences, which individuals report as mentally exhausting.^[137] A primary consequence is heightened emotional distress, as negative events—such as personal losses or traumas—are relived with vivid intensity, impeding emotional recovery. For instance, the first documented HSAM case, Jill Price, described her memory as a "special kind of hell," citing relentless recollection of heartbreaks and regrets that normal forgetting would mitigate.^[137] Empirical studies corroborate this, finding significantly elevated psychic trait anxiety in HSAM individuals compared to controls, though somatic anxiety does not differ, suggesting a cognitive-emotional rather than physiological basis.^[124] Cognitively, impaired forgetting fosters rumination, with HSAM subjects dedicating excessive time to past events, potentially at the expense of present-focused processing or forward planning.^[127] This non-selective retention also correlates with challenges in suppressing irrelevant memories, straining inhibitory control mechanisms and contributing to obsessive tendencies akin to OCD-like fixation on personal history.^[135] Overall, while HSAM confers mnemonic advantages, its impairment of forgetting diminishes quality of life, transforming memory into a burdensome archive rather than a selective tool.^[138]

Contemporary Developments

Neuroscientific and Genetic Insights

Neuroscientific research has identified active forgetting as a deliberate process involving multiple brain mechanisms, distinct from passive decay. In the hippocampus and prefrontal cortex, intentional suppression of unwanted memories occurs through dampening of neural circuits that initially encoded them, as demonstrated in functional MRI studies where participants successfully excluded specific information by reducing activity in these regions.^[139] Dopamine-releasing neurons, termed "forgetting cells," chronically signal to promote forgetting, with optogenetic activation of these cells in Drosophila enhancing memory erasure via cyclic AMP pathways.^[140] Microglia-mediated synaptic pruning contributes to natural forgetting, as evidenced in mouse models of contextual fear conditioning where microglial inhibition preserved memories that would otherwise fade.^[30] Engram competition represents a flexible neurobiological basis for forgetting, where coexisting memory traces for the same stimulus vie for dominance, leading to suppression of weaker engrams through interference in the hippocampus.^[141] Recent investigations reveal that forgetting engages broad mechanisms to reduce engram accessibility across timescales, including actin cytoskeleton remodeling and AMPA receptor endocytosis in synaptic forgetting.^[142] In rodents, prefrontal top-down control modulates hippocampal activity to facilitate adaptive forgetting, preventing overload from irrelevant information.^[66] Genetically, forgetting is regulated by memory suppressor genes that actively promote erasure rather than mere absence of retention genes. Screens in model organisms have identified nearly 100 such genes, influencing processes like consolidation and retrieval through pathways such as dopamine signaling and Rac1-mediated actin dynamics.^[143] The DRD2 gene variant correlates with everyday forgetfulness in humans, linking dopaminergic function to lapses in prospective memory.^[144] In Drosophila, specific "forgetting genes" like those encoding rutabaga (adenylyl cyclase) ensure transient memory by enabling active destabilization, preventing indefinite retention that could impair behavioral flexibility.^[140] Recent genetic studies highlight small GTPases like Cdc42 in intrinsic forgetting, where their activity in mushroom body neurons drives forgetting independent of new learning interference.^[13] Human genome-wide association studies associate variants in genes like APOE with altered forgetting rates in aging, though these primarily manifest in pathological contexts rather than normal adaptive forgetting.^[145] These insights underscore forgetting as an evolutionarily conserved, genetically tunable process essential for cognitive prioritization.^[30]

Therapeutic and Applied Implications

Deficits in active forgetting processes, including directed forgetting and think/no-think suppression, contribute to the persistence of intrusive memories in disorders such as post-traumatic stress disorder (PTSD) and major depressive disorder. In PTSD, patients demonstrate reduced intentional forgetting of trauma-related stimuli, correlating with symptom severity and hippocampal-prefrontal dysfunction that impairs inhibitory control.^[60] Similarly, depressed individuals show impaired directed forgetting specifically for negative material, fostering rumination through failure to suppress self-referential negative memories.^[60] These deficits highlight active forgetting as a cognitive marker for psychopathology, with neurotransmitter systems like dopamine and glutamate implicated in the underlying mechanisms.^[60] Therapeutic strategies targeting forgetting aim to restore inhibitory control or disrupt maladaptive memory traces. Memory reconsolidation interference, involving reactivation of emotional memories followed by pharmacological blockade (e.g., propranolol), weakens fear responses in PTSD, with clinical trials showing 50-56% symptom reduction persisting up to four months post-treatment in chronic cases.^[146] ^[147] This approach offers advantages over extinction-based therapies by inducing lasting amnesia resistant to relapse, though optimal timing and prediction error are critical for efficacy.^[146] Experimental interventions, such as NMDA receptor modulation with ketamine, show preliminary promise in enhancing forgetting for depression and PTSD by reversing long-term potentiation at synapses.^[148] However, mindfulness-based suppression techniques have not consistently improved directed forgetting of emotional content, sometimes increasing recognition of neutral to-be-forgotten items.^[149] Applied implications extend to cognitive rehabilitation and training protocols that leverage forgetting dynamics for retention optimization. The Ebbinghaus forgetting curve, describing rapid initial memory decay without reinforcement, informs spaced repetition in medical education, where distributed practice blunts forgetting rates and enhances long-term recall by 200-300% compared to massed learning.^[150] In therapeutic contexts, such as patient education for chronic illness management, repetition strategies counteract forgetting to improve adherence, reducing non-compliance linked to memory lapse by up to 40% in adherence trials.^[151] These applications underscore forgetting's role in adaptive prioritization, where selective erasure of irrelevant information supports decision-making and behavioral flexibility in clinical recovery programs.^[17]

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Mar 23, 2019 · According to Richards, the brain is concerned more with remembering details that will aid in decision-making, not irrelevant details. Studies in ...
[103]
Suppressing memory associations impacts decision-making ...
Recent research has suggested that episodic memory can guide our decision-making. Forgetting is one essential characteristic of memory. If certain memories are ...
[104]
Memory and decision making - PMC - NIH
Decisions depend on tradeoffs between factors such as generalization and specificity, and between computational speed and flexibility.
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Accelerated long-term forgetting in neurodegenerative disorders
Accelerated Long-term Forgetting (ALF) is a memory deficit characterised by normal retention up to relatively short intervals (eg, minutes, hours) with ...
[106]
Active forgetting and neuropsychiatric diseases - PubMed Central
Mar 26, 2024 · Individuals with impaired active forgetting mechanisms can experience intrusive memories, distressing thoughts, and unwanted impulses that occur in ...
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Accelerated long-term forgetting: A sensitive paradigm for detecting ...
Apr 17, 2023 · ALF is characterized by increased forgetting rates over extended delays (e.g., days, weeks, months) despite normal learning and short-term ...
[108]
Accelerated long-term forgetting as a predictor of clinical onset in ...
Accelerated long-term forgetting (ALF) is a pattern of memory dysfunction whereby encoding and initial storage of new information occurs normally but is then ...
[109]
Associations between accelerated forgetting, amyloid deposition ...
Accelerated long-term forgetting (ALF) is the phenomenon whereby material is retained normally over short intervals (e.g. minutes) but forgotten abnormally ...
[110]
Accelerated long‐term forgetting‐ALF in Mild Cognitive Impairment ...
Jun 16, 2023 · Accelerated long-term forgetting (ALF) has been considered a memory consolidation problem, whereby a person can learn and recall information ...
[111]
A Review of Accelerated Long-Term Forgetting in Epilepsy - PubMed
Dec 7, 2020 · Accelerated long-term forgetting (ALF) is a memory disorder that manifests by a distinct pattern of normal memory for up to an hour after ...
[112]
Accelerated long-term forgetting in temporal lobe epilepsy
Patients with temporal lobe epilepsy (TLE) often present with memory complaints despite performing within normal limits on standard memory tests.
[113]
Accelerated long-term forgetting in temporal lobe but not idiopathic ...
Temporal lobe epilepsy (TLE) has been associated with the phenomenon of accelerated long-term forgetting (ALF), in which memories are retained normally over ...
[114]
Memory deficits in Parkinson's disease are associated with reduced ...
We provide the first evidence of impaired beta modulation being associated with a non-motor symptom of Parkinson's disease.
[115]
Memory & Thinking Changes | Parkinson's Disease
Estimates vary, but approximately 25 percent of people with Parkinson's experience MCI. Mild cognitive impairment could stay the same, get better or worsen over ...
[116]
Memory Deficits in Parkinson's Disease Are Associated with ...
Jul 10, 2023 · The present study examined mechanisms underlying memory deficits in Parkinson's disease (PD) and their associations with brain structural ...
[117]
A Review of Accelerated Long-Term Forgetting in Epilepsy - PMC
Dec 7, 2020 · Accelerated long-term forgetting (ALF) is a memory disorder that manifests by a distinct pattern of normal memory for up to an hour after ...
[118]
Accelerated long-term forgetting in patients with acquired brain injury
Accelerated long-term forgetting can become apparent within 3–8 hours of wakefulness in patients with transient epileptic amnesia. Source: Neuropsychology.
[119]
Accelerated long-term forgetting in presymptomatic autosomal ...
Mar 13, 2018 · Accelerated long-term forgetting—during which memory impairment becomes apparent over longer periods than usually assessed, despite normal ...
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Associations between accelerated forgetting, amyloid deposition ...
Apr 3, 2025 · Accelerated long-term forgetting (ALF) is the phenomenon whereby material is retained normally over short intervals (e.g. minutes) but forgotten ...Missing: syndromes | Show results with:syndromes
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Forgetting in traumatic brain-injured patients with persistent memory ...
Relative to control Ss, the patients had an abnormally fast rate of forgetting pictures, but not words or designs. TBI patients with persistent memory ...<|separator|>
[122]
Systematic Review of Accelerated Long-term Forgetting in Children ...
Accelerated long-term forgetting (ALF) describes the phenomenon of normal learning and memory performance after short delays, but greater forgetting after ...
[123]
Accelerated long-term forgetting is not evident in adults with genetic ...
Feb 5, 2020 · Accelerated long-term forgetting (ALF) is a recently discovered memory disorder characterized by intact acquisition and retention over short ...
[124]
Highly Superior Autobiographical Memory (HSAM): A Systematic ...
Feb 23, 2024 · HSAM is categorised by rapidly retrieved, detailed and accurate autobiographical memories, and appears to avoid the normal aging process.
[125]
False memories in highly superior autobiographical memory ... - PNAS
Prior HSAM research showed a remarkable ability in these individuals to recall even distant autobiographical information with an exceptional level of accuracy.
[126]
Cortical hubs of highly superior autobiographical memory
Highly Superior Autobiographical Memory (HSAM) is a rare form of enhanced memory ... Highly superior autobiographical memory in aging: A single case study.
[127]
Highly Superior Autobiographical Memory - Center for ... - UCI CNLM
Supporting the research: The study of HSAM could significantly inform on how the brain can optimize or enhance its processing of memories, knowledge which ...
[128]
Total recall: the people who never forget | Memory | The Guardian
Feb 8, 2017 · Price was the first person ever to be diagnosed with what is now known as highly superior autobiographical memory, or HSAM, a condition she shares with around ...
[129]
A case of hyperthymesia: Rethinking the role of the amygdala ... - NIH
Here, we performed intellectual, cognitive, and neuroimaging studies with HK, a 20-year old man with autobiographical hypermnesia. Aside from being only the ...
[130]
Marilu Henner's Exceptional Memory Spurs Interest in Brain Health
Henner can recall past events in almost photographic detail thanks to a highly superior autobiographical memory (HSAM), a rare condition that has been ...
[131]
Marilu Henner Reveals New Findings About Her Rare Condition
Oct 10, 2024 · Henner is one of only 100 people worldwide identified to have highly superior autobiographical memory (HSAM), according to Brain & Life magazine.
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A Cognitive Assessment of Highly Superior Autobiographical Memory
In previous research, we found that HSAM individuals were slightly, but significantly, superior in face-name associations, paragraph recall, and a visual memory ...
[133]
[PDF] Unravelling the Enigma of Highly Superior Autobiographical Memory
Jan 1, 2025 · Currently listed on the global diagnosis list up to 2024, with only 62 documented cases, HSAM presents a fascinating cognitive and neurological ...<|separator|>
[134]
Full article: Dimensions of a hyper memory: investigating the factors ...
May 10, 2024 · Highly Superior Autobiographical Memory (HSAM) is a rare form of exceptional memory, characterised by an ability to recall personal episodes in response to ...
[135]
Article Altered brain activity during active forgetting in highly superior ...
Jun 20, 2025 · The prefrontal cortex has also been found to suppress hippocampal-dependent encoding processes during intentional forgetting.
[136]
Behavioral and neuroanatomical investigation of Highly Superior ...
May 29, 2012 · Highly Superior Autobiographical Memory (HSAM) is a newly described ability in which individuals are able to recall events from their personal ...
[137]
The Downside of Having an Almost Perfect Memory - Time Magazine
Dec 8, 2017 · Fewer than 100 people have been diagnosed with highly superior autobiographical memory (HSAM). Here's what that means.
[138]
Hyperthymesia and Highly Superior Autobiographical Memory (HSAM)
Sep 20, 2025 · As extraordinary as hyperthymesia may seem, the "inability to forget" has potentially serious consequences to a person's health and well-being.
[139]
How the Brain Actively Removes Unwanted Memories
Jun 16, 2025 · Active Forgetting: The brain can intentionally suppress memory traces using specific neural mechanisms. Circuit Deactivation: Forgetting is ...
[140]
The Pioneer of Memory and Forgetting: Neuroscientist Ronald L ...
Davis discovered that forgetting is an active process, using "forgetting cells" and genes, and that sleep enhances memory retention while sensory stimulation ...
[141]
engram competition as a flexible mechanism of forgetting - Cell Press
Aug 13, 2025 · Accumulating evidence suggests that forgetting reflects altered activation of engram cells, with memories persisting in a latent state rather ...
[142]
Neurobiological mechanisms of forgetting across timescales - PubMed
These studies reveal that forgetting engages a broad collection of mechanisms that function to reduce engram accessibility.
[143]
Memory suppressor genes: Modulating acquisition, consolidation ...
Oct 20, 2021 · Almost 100 memory suppressor genes with diverse functions have been discovered that affect not only consolidation but also acquisition and forgetting.<|separator|>
[144]
Genetic factor contributes to forgetfulness | ScienceDaily
Mar 21, 2014 · Psychologists from the University of Bonn have found a connection between such everyday lapses and the DRD2 gene.
[145]
Genetic variants associated with age‐related episodic memory ...
Nov 19, 2024 · Previous family and twin studies have demonstrated a moderate to high genetic influence on episodic memory in both cognitively healthy and ...Missing: forgetting | Show results with:forgetting
[146]
Memory Reconsolidation Interference as an Emerging Treatment for ...
We point out specific advantages of interventions based on memory reconsolidation interference over traditional treatment for emotional disorders.
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https://doi.org/10.1016/j.jpsychires.2007.05.006
[148]
Memory as a new therapeutic target - PMC - NIH
Memory is a dynamic process. In so being, it provides clinical targets for the treatment of mental disorders, such as forgetting and reconsolidation. As our ...
[149]
Suppress to Forget: The Effect of a Mindfulness-Based Strategy ...
Mar 21, 2017 · A very important aspect of forgetting is its interaction with emotion. Affective events are often granted special and priority treatment over ...
[150]
Spaced Effect Learning and Blunting the Forgetfulness Curve
Spaced learning has demonstrated promise as a countermeasure to the forgetfulness problem in medical training, becoming a ubiquitous part of individual study ...
[151]
Resetting the Forgetting Curve: Enhancing Patient Experience
To address the forgetting curve, physicians can implement several strategies to improve patient knowledge retention, including: Repetition: Repeating important ...