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Afterimage

An afterimage is a visual illusion in which an image continues to appear in one's field of vision after exposure to the original stimulus has ended, typically lasting from seconds to minutes.^[1] This phenomenon arises from the adaptation or overstimulation of the eye's photoreceptor cells, such as rods and cones in the retina, leading to a temporary imbalance in neural signaling.^[2] Afterimages are classified into two primary types: positive and negative. Positive afterimages maintain the same colors and brightness as the original stimulus and are often generated through cortical processes in the brain rather than solely retinal mechanisms.^[3] In contrast, negative afterimages feature complementary colors and inverted lightness levels to the original, resulting from the fatigue of retinal photoreceptors after prolonged viewing of a bright or high-contrast image.^[4] These retinal-based effects do not transfer between eyes, confirming their origin at the level of the retina.^[1] The physiological basis of afterimages involves the chemical changes in photopigments like rhodopsin, which becomes bleached by intense light and requires time to regenerate, causing the persistent perception.^[1] While typically benign and a normal aspect of human vision, unusually prolonged or frequent afterimages can signal underlying conditions such as palinopsia, often linked to neurological disruptions in visual processing areas of the brain.^[5] Research continues to explore the interplay between retinal and cortical contributions to these illusions, highlighting their role in understanding visual perception.^[6]

Overview and History

Definition and Characteristics

An afterimage is a visual illusion in which a representation of an original stimulus persists or a complementary image emerges in the visual field after the stimulus itself has ceased, resulting from the adaptation or overstimulation of retinal cells.^[7] This phenomenon occurs universally in healthy human vision as a normal response to intense or prolonged visual input, but prolonged afterimages lasting beyond typical durations may signal underlying medical conditions such as palinopsia.^[2]^[5] Key characteristics of afterimages include their transient nature, typically enduring from a few seconds to several minutes depending on the stimulus intensity and exposure duration, and their tendency to manifest most clearly against a uniform or blank background, such as a white wall. In negative afterimages, which are the most common form, colors appear inverted or complementary to the original stimulus due to selective fatigue in the retinal photoreceptors.^[8] For instance, staring at a bright light source may produce a lingering dark spot, while fixating on a colored flag, such as the American flag, can yield an afterimage with inverted hues—red becoming cyan, blue turning yellow, and so on—upon shifting gaze to a neutral surface.^[1]^[9] At its core, the process involves fatigue of retinal photoreceptors, including cones sensitive to specific wavelengths and rods for low-light detection, which disrupts the balance in the visual system's opponent color channels—red-green, blue-yellow, and black-white—leading to the illusory perception.^[10]^[11] This adaptation reflects the retina's mechanism for normalizing visual input, though higher neural processes may contribute to the conscious experience of the illusion.^[12]

Historical Development

The phenomenon of afterimages dates back to ancient observations of visual persistence. Aristotle, in his Parva Naturalia, provided the earliest recorded descriptions of afterimages, noting their occurrence after prolonged fixation on bright stimuli and linking them to the persistence of visual sensations beyond the removal of the exciting cause.^[13] These accounts laid foundational groundwork for understanding afterimages as a form of visual illusion arising from sensory adaptation. In the early 18th century, Isaac Newton's Opticks (1704) advanced this by documenting color afterimages in optical experiments, observing that spectral colors produced lingering impressions on the retina after the prism or light source was withdrawn, contributing to early insights into chromatic persistence.^[14] The 19th century marked significant experimental progress in dissecting afterimage mechanisms. Jan Evangelista Purkinje's 1825 dissertation detailed subjective visual phenomena, including the Purkinje effect—where color perceptions shift toward blue-green in low light—and extensive observations of afterimage color changes and durations under varying conditions.^[15] Building on this, Hermann von Helmholtz's Handbook of Physiological Optics (1867) formalized adaptation theory, positing that afterimages result from temporary fatigue or exhaustion of retinal elements sensitive to specific colors or intensities, providing a physiological framework for their negative appearance.^[16] Early 20th-century developments integrated afterimages into broader perceptual theories. Ewald Hering's opponent-process theory, introduced in 1878 and expanded through physiological studies in the 1960s, explained afterimages as imbalances in antagonistic color channels (red-green, blue-yellow, black-white), accounting for their complementary hues without delving into neural details here.^[17] In the 1920s and 1930s, Gestalt psychologists such as Max Wertheimer and Kurt Koffka incorporated afterimages into discussions of holistic perception, emphasizing the brain's active structuring of visual experience over elemental sensations.^[18] Mid-century psychophysical experiments, including those measuring afterimage latency and duration in monocular and binocular conditions (e.g., 1951 studies), quantified variability in persistence times, often ranging from seconds to minutes depending on stimulus intensity.^[19] Later milestones included technological advancements in the 1960s, when psychophysics laboratories first used photographic techniques to induce and document controlled afterimages, enabling precise replication of negative patterns without direct observer fixation.^[20] By the post-2000 era, functional magnetic resonance imaging (fMRI) studies confirmed cortical substrates, revealing retinotopic activation in primary visual cortex (V1) that tracks perceived rather than retinal afterimage size, alongside color processing in area V4.^[21]^[22] Recent research as of 2025 has further elucidated the neural mechanisms, showing that afterimages involve distributed brain processes beyond retinal adaptation, including non-opponent color representations and correlations with visual imagery vividness.^[23]^[24]^[25] These neuroimaging efforts shifted focus from purely retinal explanations toward distributed neural dynamics.

Physiological Mechanisms

Neural and Retinal Processes

At the retinal level, afterimages emerge from the adaptation of photoreceptor cells, where prolonged exposure to a visual stimulus causes selective fatigue in cone types. For instance, overstimulation of long-wavelength-sensitive (L-) cones by red light diminishes their signaling, leading to a compensatory green afterimage from relatively heightened medium-wavelength-sensitive (M-) cone activity when viewing a neutral field.^[26] In low-light environments, rod photoreceptors contribute similarly through temporary saturation; a brief intense flash can saturate rods, rendering subsequent stimuli invisible until the afterimage decays and sensitivity recovers.^[27] This adaptation aligns with the opponent-process theory, formulated by Ewald Hering in 1878, which describes color vision via three paired antagonistic mechanisms: red versus green, blue versus yellow, and black versus white. Fatigue in one channel's pole during stimulation inhibits its opponent, producing a rebound effect upon offset that manifests as a complementary afterimage, such as a negative one from cone imbalance.^[8] Adapted retinal signals pass through the lateral geniculate nucleus (LGN), where parvocellular pathways relay imbalanced opponent signals with adaptation time constants of approximately 17–21 seconds, sustaining the afterimage's neural representation.^[28] Cortical involvement begins in the primary visual cortex (V1), where deep layers process persistent edge and contour information via feedback mechanisms, followed by area V4 for chromatic processing; in V1, prolonged activity peaks 7–11 seconds after stimulus removal.^[12] As of 2025, research has identified layer-specific mechanisms in V1 and suggested that color afterimages may not strictly follow opponent-process predictions.^[29]^[23] Afterimage duration diminishes through neural recovery, modeled as an exponential decay: I(t) = I_0 e^{-t/\tau}, where I(t) is intensity at time t, I_0 is initial intensity, and \tau \approx 10–$30$ seconds reflects cone recovery timescales in parvocellular circuits.^[28]

Influencing Factors

The properties of the inducing stimulus significantly influence the occurrence, intensity, and duration of afterimages. Brighter stimuli generally produce stronger and longer-lasting afterimages due to greater photopigment bleaching in the retina.^[8] Higher contrast between the stimulus and its background enhances afterimage vividness, as it amplifies the differential adaptation of opponent color channels.^[30] The duration of exposure plays a key role, with afterimage strength increasing with adaptation time up to an optimal range of approximately 10-30 seconds, beyond which diminishing returns or saturation may occur; for instance, exposures of 20-30 seconds are commonly used in experiments to reliably induce measurable afterimages.^[31] Larger stimulus fields tend to produce afterimages with greater spatial spread, as they engage more retinal area and lead to broader adaptation effects.^[32] Environmental factors also modulate afterimages, often by altering the state of retinal adaptation. Dark adaptation, achieved through prior exposure to low ambient lighting, prolongs afterimage duration by increasing retinal sensitivity and slowing recovery from photopigment bleaching.^[30] Eye movements during or after adaptation can stabilize or distort afterimage perception; for example, saccades may cause trailing effects or fragmentation, while steady fixation preserves clarity.^[33] Blinks, conversely, can slightly extend afterimage visibility under certain lighting conditions by interrupting adaptation recovery.^[34] Individual differences contribute to variability in afterimage characteristics, reflecting physiological and health-related factors. Age affects persistence, with older adults exhibiting longer afterimage durations compared to younger individuals, possibly due to slower neural recovery processes despite age-related photoreceptor decline.^[35] Certain pharmacological agents, such as antidepressants like trazodone, can prolong afterimages by inducing palinopsia, a condition of enhanced visual perseveration.^[36] Pathological conditions like migraine increase susceptibility to afterimages, often manifesting as illusory palinopsia with heightened sensitivity to visual stimuli and impaired habituation.^[37] In experimental contexts, variables like wavelength specificity allow targeted investigation of afterimage mechanisms, as shorter wavelengths (e.g., blue light around 455 nm) induce faster cone fatigue in short-wavelength-sensitive mechanisms, leading to quicker onset but potentially shorter duration compared to longer wavelengths.^[38] Measurement techniques, such as perimetry, quantify afterimage size and extent by mapping perceived boundaries against a uniform field, providing objective metrics for clinical and research applications.^[39] These factors interact with underlying retinal adaptation processes to shape afterimage phenomenology.^[8]

Types of Afterimages

Negative Afterimages

Negative afterimages occur when the visual system perceives complementary colors or inverted brightness levels following the removal of a stimulus, such as a red pattern yielding a cyan or green afterimage and bright areas appearing dark.^[40] This inversion arises from the fatigue or adaptation of specific retinal photoreceptors, leading to a temporary imbalance where the overstimulated channels become less responsive, causing the opposite response to dominate.^[41] For instance, prolonged fixation on a bright white region results in a dark afterimage due to the reversal in luminance processing. The mechanism involves a strong imbalance in cone-opponent processes, where the three types of cone cells (sensitive to long-, medium-, and short-wavelength light) adapt unevenly, aligning with the opponent-process theory of color vision that posits antagonistic pairs like red-green and blue-yellow.^[40] A classic demonstration is staring at the American flag for about 30-60 seconds, after which viewing a white surface produces an afterimage with cyan stripes, a yellow field, and black stars and stripes, reflecting the complementary colors of the original red, blue, and white elements.^[42] This effect highlights how adaptation in the L-M (red-green) and S-(L+M) (blue-yellow) opponent channels inverts the perceived hues.^[40] These afterimages peak in intensity immediately after stimulus offset and are best observed against a mid-gray background, which minimizes interference from surrounding luminance and enhances contrast.^[43] They typically last 5-30 seconds, fading as the photoreceptors recover sensitivity, though duration can vary with adaptation strength and individual factors.^[1] Historically, Johann Wolfgang von Goethe explored negative afterimages in his 1810 Theory of Colours, using color wheel experiments to demonstrate physiological color oppositions, such as the emergence of complementary hues after fixating on saturated colors.^[44]

Positive Afterimages

Positive afterimages are visual sensations that persist briefly after the removal of a stimulating light source, retaining the same hue, brightness polarity, and general shape as the original stimulus, though they appear fainter and less saturated. For instance, fixating on a red light source may produce a lingering red spot in the visual field upon gaze shift.^[45]^[46] These afterimages arise from retinal persistence following adaptation, such as the partial recovery of fatigued photoreceptor cells (cones and rods), but are often modified by cortical processes in the brain, which can contribute to their generation, particularly for global or filled-in types. Rod-cone interactions also contribute, particularly in mesopic (low-light) conditions where rods recover more slowly than cones, prolonging the perception after bright exposure. They commonly occur when transitioning from a bright stimulus to a darker environment, such as the lingering image from a projector beam or the glow of a lit match viewed in near-darkness.^[7]^[45] The duration of positive afterimages is typically brief, often less than a second, but can extend to a few seconds depending on factors like stimulus luminance, exposure time, and ambient lighting, with higher intensity leading to longer persistence. Observation is enhanced by slowly moving the eyes or blinking, which can briefly revive the image by shifting retinal adaptation.^[7]^[46]^[34] In rare variants, such as those involving Troxler fading in peripheral vision, prolonged fixation on a stabilized stimulus can lead to fading followed by positive-like persistence upon eye movement, due to neural adaptation in retinal ganglion cells.^[43] Influencing factors like ambient lighting can modulate intensity, with darker surrounds prolonging visibility.^[45]

Afterimages on Empty Backgrounds

When projected onto an empty or uniform background, such as a blank white or gray field, afterimages often appear to float detached from any surface or expand beyond their original dimensions due to the absence of spatial anchors and contextual cues. This lack of surrounding features deprives the visual system of reference points, leading to a heightened sense of illusoriness and increased vividness as the brain interprets the persistent retinal signal without integration into a structured scene.^[47]^[48]^[30] The perceptual effects on empty backgrounds include apparent spontaneous movement or growth of the afterimage, as the absence of stabilizing elements allows minor eye movements or neural filling-in processes to distort its perceived stability and scale. For instance, after fixating on a spinning Benham's top—a black-and-white disk that induces illusory colors through temporal modulation—these colors can persist as dynamic, moving afterimages when viewed against a blank field, enhancing the sense of motion without external stimuli.^[49]^[50] These effects are mechanistically nuanced by interactions with the Troxler effect, where prolonged fixation on a uniform field causes peripheral fading that can reverse, momentarily amplifying the afterimage's salience and preventing its dissipation. Studies demonstrate that afterimages projected onto empty fields are perceived as larger than on textured backgrounds, attributable to the visual system's size-distance scaling, which interprets the unconstrained projection as occurring at greater depth.^[51]^[52]^[47] In psychophysical research, afterimages on empty backgrounds have been employed since Joseph Plateau's 1830s experiments on the persistence of visual impressions, which quantified retinal retention durations to explore motion illusions. Contemporary investigations utilize virtual reality simulations to isolate these effects, presenting controlled uniform fields that enable precise measurement of afterimage dynamics without environmental interference.^[53]^[54]

In Vision Testing and Science

Afterimages serve as valuable tools in diagnostic applications for assessing visual function. In screening for color blindness, negative afterimages have been employed to differentiate between color-weak and fully color-blind individuals by measuring differences in their duration and intensity, providing a more reliable classification than traditional tests like Ishihara plates.^[55] This approach leverages the opponent-process theory of color vision, where inverted afterimages reveal anomalies in color adaptation.^[4] In vision research, afterimages are used to quantify neural adaptation and visual processing depth in laboratory settings. For instance, studies in the 2020s have shown that afterimage duration correlates with the subconscious processing of invisible stimuli, enabling researchers to measure visual responses without relying on conscious awareness.^[56] Additionally, afterimage duration has been linked to temporary impairments in visual acuity, such as recovery times following glare exposure, where acuity returns within 30 to 60 seconds under dark conditions, aiding in the evaluation of photic adaptation effects.^[45] Clinically, prolonged afterimages manifest in conditions like palinopsia, particularly as part of migraine aura, where individuals with migraine with aura experience significantly longer afterimage durations—averaging 12.6 seconds compared to 5.5 seconds in healthy controls—indicating potential subcortical or cortical hypersensitivity.^[57] In Charles Bonnet syndrome, afterimages or palinopsia affect approximately 10% of cases, appearing as persistent echoes of recent visuals superimposed on the environment, distinct from typical CBS hallucinations.^[58] Therapeutically, afterimage transfer methods have been applied in vision therapy for amblyopia, particularly in cases with eccentric fixation, improving fixation and acuity in children through targeted afterimage exercises.^[59]^[60] Recent advancements include computational models to analyze afterimage characteristics and dynamics. These tools, influenced by factors like stimulus intensity, support precise quantification in both research and clinical contexts.^[45]

In Art, Culture, and Technology

In the realm of visual arts, afterimages play a central role in Op Art, a movement that gained prominence in the 1960s through the use of geometric patterns to manipulate perception. British artist Bridget Riley exemplifies this approach in works like Current (1964), where high-contrast black-and-white stripes create illusory vibrations and persistent afterimages that evoke motion upon prolonged viewing.^[61]^[62] These effects arise from the retina's response to intense visual stimuli, transforming static canvases into dynamic experiences that challenge viewers' sensory boundaries.^[63] Filmmakers have similarly harnessed afterimages and related persistence of vision to enhance narrative flow and emotional impact. Fade-out and dissolve transitions, common since the early 20th century, rely on the retina's retention of an image for approximately 1/25th of a second, allowing one scene to blend into the next without abrupt discontinuity.^[64]^[65] This technique, integral to montage editing, exploits afterimage formation to simulate seamless continuity, as seen in classic films where bright exposures give way to darker frames, leaving ghostly imprints.^[66] Culturally, afterimages symbolize lingering impressions in various media, including light-based festivals that foster shared perceptual phenomena. Installations at events like the Vivid Sydney festival employ synchronized LED projections, enhancing communal immersion. In contemporary LED art post-2010, artists like Olafur Eliasson calibrate installations such as Your Rainbow Panorama (2011) to provoke deliberate afterimages through saturated, directional lighting, blurring the line between object and viewer perception.^[67]^[68] Technological innovations in AR and VR often address afterimage artifacts to improve user comfort. Pulse-width modulation (PWM) in OLED displays, used for brightness control, can induce flicker-related afterimages, prompting designs that mitigate these via higher frequencies or DC dimming in headsets like those from Meta and Apple.^[69] In video games, developers incorporate afterimage effects for immersive illusions, as in titles like Returnal (2021, with updates into 2022), where adaptive lighting and particle systems create trailing visual echoes to heighten tension during fast-paced action.^[70] Music visualizers extend this into interactive media, syncing pulsating lights and colors to audio waveforms to evoke afterimage-like persistence. Tools like Synesthesia software generate real-time animations that pulse with bass frequencies, inducing residual color overlays in viewers' vision, often used in live performances to amplify sensory synesthesia.^[71]^[72]

References

[1]
Afterimage: Perception & Light Science Activity - Exploratorium
After looking at something bright, such as a lamp or a camera flash, you may continue to see an image of that object when you look away.
[2]
Persistent afterimage in eye - CEENTA
Oct 18, 2019 · What causes an afterimage? Negative afterimages occur when the rods and cones, which are part of the retina, are overstimulated and become ...
[3]
Illusions That Won't Go Away | Science | AAAS
Afterimages come in two basic types: those formed on the eye's retina and those conjured up in the brain. For example, a bright light can bleach pigments in ...
[4]
Negative Afterimages - The Illusions Index
Negative afterimages exhibit inverted lightness levels, or colours complementary to, those of the stimulus and are usually brought on by prolonged viewing of a ...
[5]
Palinopsia: What Is It, Types, Causes, Diagnosis, Treatment
Nov 26, 2019 · Physiological afterimage is a normal response that occurs when an image briefly persists after looking away, such as following a camera flash.Categories of palinopsia · Causes
[6]
New research shows that brain is involvedin visual afterimages
Aug 30, 2001 · The perceived disk is known as an afterimage, and has long been thought to be an effect of the "bleaching" of photochemical pigments or ...
[7]
Visual imagery vividness correlates with afterimage conscious ...
Dec 20, 2023 · Afterimages are illusory visual perseverations – lasting seconds to minutes – that often follow light stimulation but absent the original ...Missing: definition | Show results with:definition
[8]
Afterimage - an overview | ScienceDirect Topics
There are two major types of afterimages such as negative afterimage and positive afterimage (Lee, 2005).
[9]
Complementary colours, after-images, retinal fatigue, colour mixing ...
Retinal fatigue causes complementary colours to be seen in after-images. This page has six animations that produce after-images (optical illusions) in ...
[10]
What is the Opponent Process Theory of Color Vision? - Verywell Mind
Nov 30, 2023 · Opponent process theory suggests that looking at one color for a long period causes those receptor cells to become fatigued. When they begin ...Opponent Process Theory vs... · How It Works · Examples
[11]
Numerical study of short-term afterimages and associate properties ...
11, a positive afterimage at the retinal centre, lasts about 40 ms, and is followed by a negative afterimage, which lasts indefinitely but fades away. This ...Missing: inversion | Show results with:inversion
[12]
The human brain mechanisms of afterimages - PubMed Central - NIH
Afterimages are common visual illusions that have long attracted scientific interest, yet their neural mechanisms remain little understood.
[13]
[PDF] Why Do Patterned Afterimages Fluctuate in Visibility?
Afterimages have proved to be one of the most enduring of visual curiosities. Aristotle described the afterimages that follow pro- longed fixation and brief ...
[14]
The Project Gutenberg eBook of Opticks:, by Sir Isaac Newton, Knt.
This new Edition of Sir Isaac Newton's Opticks is carefully printed from the Third Edition, as it was corrected by the Author's own Hand, and left before his ...Missing: afterimages | Show results with:afterimages
[15]
Jan Evangelista Purkinje - Portraits of European Neuroscientists
In his first book (1823) he gave detailed descriptions of phenomena such as afterimages, the visibility of the retinal blood vessels (the Purkinje tree), and ...<|separator|>
[16]
The Constancy of Colored After-Images - PMC - PubMed Central
We propose instead that the color of after-images is generated after colors themselves are generated in the visual brain.
[17]
Studying Color Perception Using Color Afterimages Visual Illusion
Apr 30, 2023 · ... opponent space. One way that color opponency was discovered-in 1878 by Ewald Hering, even before scientists had access to techniques for ...<|separator|>
[18]
Latency and duration of monocular and binocular after-images.
Latency and duration of monocular and binocular negative after-images of 20 male S's were measured and compared. The latency of binocular after-images was ...
[19]
[PDF] Negative Afterimage without
A procedure is described which causes an observer to see a negative after- image of a visual field without seeing the field itself. This phenomenon is shown to.
[20]
Retinotopic activity in V1 reflects the perceived and not the retinal ...
Aug 9, 2025 · We show that the retinotopic activity in the primary visual cortex (V1) associated with viewing an afterimage is modulated by perceived size, ...
[21]
The Constancy of Colored After-Images - Frontiers
It is likely that V4 plays a critical role. V4 is implicated in color ... Color architecture in alert macaque cortex revealed by FMRI. Cereb. Cortex ...
[22]
Neuroscience for Kids - Color Vision
Prolonged viewing of the red stimulus causes adaptation in the red-selective cones: like other primary sensory cells, they stop firing if bombarded for too long ...
[23]
[PDF] THE DELAYED ROD AFTERIMAGE
This technique pro- duces dramatic positive rod afterimages, within which one can discriminate differences that were quite in- visible in the initial image.
[24]
Implications for Adaptation, Negative Afterimages, and Visual Fading
Introduction. A fascination with visual afterimages since the time of Purkinje (1825; Anstis et al., 1978) has produced a wealth of psychophysical studies that ...
[25]
Visual imagery vividness correlates with afterimage brightness and ...
Dec 20, 2023 · For example, the duration of afterimages are not identical for equally bright grating inducers, instead partly modulated according to the ...
[26]
Are Your Eyes Playing Tricks on You? Discover the Science Behind ...
Afterimages are the images you see after staring at an object for several seconds and then looking away. You will also learn how different cone cells in your ...
[27]
Size-Dependent Asymmetries in Both Negative Afterimages and ...
This demonstrates that size influences the strength, duration, and latency of the asymmetry between dark and bright afterimages, although the relationship ...
[28]
Interaction between contours and eye movements in the perception ...
Factors such as attention and eye movements during adaptation can influence the resultant perception of afterimages (Bachy & Zaidi, 2014; Lak, 2008; Suzuki & ...
[29]
The effect of eye movements and blinks on afterimage appearance ...
We found neither saccades nor pursuit reduced strong afterimage duration, and blinks actually increased afterimage duration when tested in the light.
[30]
Persistence of Complementary Afterimages as a Function ... - PubMed
Afterimage persistence was found to be a direct function of exposure duration and to be greater for the older subjects as compared with the younger ones.
[31]
Opposing effects of attention and consciousness on afterimages
Apr 27, 2010 · We show that selective attention and visual consciousness have opposite effects: paying attention to the grating decreases the duration of its afterimage.<|control11|><|separator|>
[32]
Is palinopsia in migraineurs an enhanced physiological phenomenon?
Jan 14, 2016 · Visual afterimage and palinopsia may be clinical markers of sensitization and impaired habituation of sensory neurons. Studies on palinopsia in ...Missing: susceptibility | Show results with:susceptibility<|control11|><|separator|>
[33]
(PDF) Determination of the time dependence of colored afterimages
Aug 9, 2025 · By simply glancing into such a device for time durations of less than 10 seconds a long-lasting afterimage that slowly changes colors was ...Missing: optimal | Show results with:optimal
[34]
Measuring palinopsia: Characteristics of a persevering visual ...
May 15, 2012 · Perimetry showed an incongruous relative defect in his left inferior quadrant. CQ explained that the afterimages in his left inferior quadrant ...
[35]
Perception Lecture Notes: Color
In the retina, the cone signals get recombined into opponent mechanisms: ... mechanism gives a negative response. Likewise for yellow/blue. Color opponency ...Missing: imbalance | Show results with:imbalance
[36]
Cortical mechanisms for afterimage formation - PubMed Central - NIH
Jan 23, 2017 · This is called negative after image (AI). AI formation has traditionally been attributed to the bleaching of retinal photoreceptors,. More ...
[37]
Afterimages
When you stare at a particular color for too long, these receptors get "tired" or "fatigued.". After looking at the flag with the strange colors, your receptors ...
[38]
Cortical mechanisms for afterimage formation: evidence from ...
Jan 23, 2017 · Whether the retinal process alone or retinal and cortical processes jointly determine afterimage (AI) formation has long been debated.
[39]
Colour Theory (Chapter 23) - Goethe in Context
Moreover, Newton proved that observed colours are the result of objects interacting with light which is already coloured, rather than objects generating the ...<|separator|>
[40]
Visual Characteristics of Afterimage under Dark Surround Conditions
The results clearly showed that the exposure time, luminance level and background luminance were the factors that significantly influenced the afterimage ...
[41]
https://pmc.ncbi.nlm.nih.gov/articles/PMC5253736/
[42]
The size-distance scaling of real objects and afterimages is ...
May 12, 2025 · This study investigated whether the principles of size constancy apply in the same way to afterimages and real objects.
[43]
Adaptive Mechanisms and Afterimages - Sapien Labs | Shaping the ...
Aug 26, 2019 · Longer exposure times (800 ms) led to even further decay of afterimages, the maximum being reached at about 50% of clean up. Therefore, about ...Missing: exponential tau
[44]
Afterimage size is modulated by size-contrast illusions | JOV
We present evidence that the size of an afterimage is also modulated by its surrounding context. We employed a new version of the Ebbinghaus–Titchener illusion.
[45]
Benham's Top unrolled - Michael Bach
Feb 5, 2014 · Interactive demonstration of the “Benham Top” colours, w/o rotation.
[46]
Faded visual afterimages reappear after TMS over early visual cortex
Aug 2, 2018 · In perceptual filling-in, fMRI activity in primary visual area V1 tracked the subjectively perceived filled-in surface between two moving ...Missing: V4 | Show results with:V4
[47]
Reduced Fading of Visual Afterimages after Transcranial Magnetic ...
Sep 1, 2019 · In perceptual filling-in, fMRI activity in primary visual area V1 tracked the subjectively perceived filled-in surface between two moving ...
[48]
[PDF] Vision and Visuality - Monoskop
Some of the most celebrated of these experiments were Joseph Plateau's calculation, in the. 1830s, of the average duration of an afterimage, or persistence of.
[49]
Computational Techniques Enabling the Perception of Virtual ...
We develop computational techniques enabling shape display exclusive to the retinal afterimage. Keywords: arts and humanities; visual arts; visual perception; ...
[50]
Studies in color blindness: I. Negative after-images. - APA PsycNet
Twenty subjects originally classified as color-blind by the Ishihara test were reclassified as color-weak (8) and color-blind (12) on the basis of reliable ...Missing: inversion screening
[51]
Afterimage duration depends on how deeply invisible stimuli were ...
Aug 1, 2023 · Afterimages could be an effective tool for quantifying visual responses, irrespective of observers' conscious awareness of a presented stimulus.
[52]
Afterimage duration differs for migraine with or without aura - Rimmele
Mar 28, 2025 · The aim of this cross-sectional study was to investigate the duration of afterimages in patients with migraine, migraine with aura (MwA), and migraine without ...
[53]
Afterimages: a lesser known aspect of CBS
Palinopsia (afterimages) are recognised as a medical symptom of some form of distortion to normal visual processing.
[54]
After-image transfer: a therapeutic procedure for amblyopia - PubMed
After-image transfer: a therapeutic procedure for amblyopia. Am J Optom Arch Am Acad Optom. 1972 Jan;49(1):65-9. Author. E Caloroso. PMID: 4500614.Missing: vision | Show results with:vision
[55]
Effect of afterimage therapy in treatment children's eccentric fixation ...
METHODS: Afterimage therapy was used to manage the amblyopia with eccentric fixation in 60 children.Missing: vision | Show results with:vision
[56]
Bridget Riley and Op Art | Art UK
They experiment with abstract geometric shapes and patterns to explore a range of perceptual phenomena including dazzling, afterimages and the illusion of ...
[57]
Bridget Riley and Op Art - Webexhibits
As your eyes explore the picture to the left, can you continue to see momentary afterimages (white dots) that cause a slight flickering effect? Click to unmute.
[58]
Bridget Riley & Op Art: Master of Perception, Illusion & Legacy
It's like your brain trying to rebalance what it's seeing, but Riley has already stacked the deck! Afterimages: Stare at a bright color, then look away, and ...Who Is Bridget Riley? The... · Op Art's Enduring Legacy... · Q: Is Op Art Merely...
[59]
Persistence of Vision Explained: What Is Persistence of Vision? - 2025
Sep 28, 2021 · Persistence of vision is an optical illusion where the human eye perceives the continued presence of an image after it has disappeared from view ...
[60]
Persistence of Vision: The Optical Phenomenon Behind Motion ...
When an image is projected onto the retina, it lingers for about 1/25th of a second before fading away. If another image replaces it within that time frame, the ...
[61]
What is Persistence of Vision? Definition of an Optical Phenomenon
May 11, 2020 · Persistence of vision is the optical phenomenon where the illusion of motion is created because the brain interprets multiple still images as one.<|separator|>
[62]
It glows! The world's most incredible light festivals | CNN
From the skylines of Singapore to the canals of Amsterdam, festivals around the world are using everything from neon to lanterns to create these glowing works ...
[63]
8 Colorful Installations by Olafur Eliasson - TheCollector
Jul 5, 2024 · The afterimage effect is a result of staring at a bright, sometimes colorful, light for a long time. Think of the lasting flash of a camera or ...Missing: LED post-
[64]
Optics & Art - Optics & Photonics News
In a new feature, OPN highlights works by eight artists inspired by light—and its ability to transform the world around us.
[65]
Visual artifacts caused by pulse width modulation in AR/VR displays
Many of these displays are modulated digitally using pulse width modulation (PWM) methods. Examples include micro-LED, Liquid Crystal on Silicon (LCOS), and ...Missing: afterimages OLED
[66]
Illusions in game design : r/gamedesign - Reddit
Jan 6, 2022 · Illusions might sound like a strange word choice in reference to game design, but in fact much of what is done to make games is smoke and mirrors.When I move the camera in any game, I get a slight after image ...Weird Afterimages on some games : r/pcmasterrace - RedditMore results from www.reddit.com
[67]
Synesthesia - Live Music Visualizer - VJ Software
A dynamic visual instrument. Synesthesia allows anyone to create mind-blowing visual experiences, show-ready for your projector, LED wall, or livestream.Download · Pricing / Purchase · General - Synesthesia Docs · Synesthesia Docs
[68]
Music listening evokes story-like visual imagery with both ... - NIH
Oct 26, 2023 · There is growing evidence that music can induce a wide range of visual imagery. To date, however, there have been few thorough investigations ...