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Secondary articulation

Secondary articulation is a phonetic phenomenon in which a consonant is produced with an additional, simultaneous articulatory gesture that involves a lesser degree of constriction than the primary articulation, often resembling an approximant or vowel-like quality superimposed on the main consonantal stricture.^[1] This secondary gesture modifies the acoustic and perceptual properties of the sound without creating a fully independent place of articulation.^[2] The most common types of secondary articulation include palatalization, where the tongue body is raised toward the hard palate; labialization, involving lip rounding; velarization, with the tongue body raised toward the velum; and pharyngealization, featuring constriction in the pharynx.^[1] These modifications can be phonemically contrastive in various languages—for instance, palatalized consonants distinguish meaning in Russian, while pharyngealized "emphatic" consonants do so in Arabic.^[1] Labialization appears in languages like those of the Pacific Northwest, where it contrasts with non-labialized segments.^[1] Secondary articulations differ from double articulations, which involve two equally prominent strictures (e.g., labio-velar stops like [kp]), as the secondary component here is subordinate and often arises from coarticulatory influences between consonants and adjacent vowels.^[1] In the International Phonetic Alphabet (IPA), they are transcribed using diacritics, such as ʷ for labialization or ʲ for palatalization, facilitating precise representation across linguistic inventories.^[2] These features play a crucial role in phonological systems, influencing sound inventories, assimilation processes, and historical sound changes in diverse languages worldwide.^[1]

Fundamentals

Definition and Characteristics

Secondary articulation refers to the superimposition of a secondary stricture of lesser degree onto a primary articulation in the vocal tract, typically involving a vowel-like approximant gesture added to a consonantal primary stricture.^[3] This results in co-articulated sounds where the secondary feature modifies the primary without independent prominence, distinguishing it from sequences of distinct segments.^[4] Key characteristics of secondary articulation include the simultaneous execution of two articulatory gestures, with the secondary acting as a "coloring" element that alters the primary sound's quality, such as through lip rounding or tongue raising toward a specific position.^[4] For instance, labialized velars like [kʷ], found in numerous languages, combine a primary velar closure with secondary lip protrusion, enhancing the consonant's perceptual profile without creating a separate syllabic element.^[5] These features are inherently co-articulated, meaning the secondary stricture overlaps temporally with the primary, often extending into adjacent vowels. Phonetically, secondary articulation presupposes a hierarchy of stricture degrees in the vocal tract, ranging from complete closure in stops (highest stricture), to narrow approximation in fricatives, to more open configurations in approximants (lowest stricture among consonants).^[6] The secondary stricture must always be of a lesser degree—typically approximant-like—to avoid competition with the primary, ensuring the latter remains the dominant perceptual cue.^[3] Acoustically, secondary articulations produce distinctive formant transitions that influence the spectral characteristics of nearby vowels, such as lowering of the second formant (F2) in the case of labialization, which creates a perceptual "coloring" effect unique to these complex segments.^[5] These transitions arise from the overlaid gestures and help distinguish secondary-articulated consonants from their plain counterparts in languages where such features are phonemic.^[5]

Distinction from Primary Articulation

In phonetics, the primary articulation of a consonant is defined by the principal place and manner of stricture formation, such as the complete closure at the lips for a bilabial stop .^[3] Secondary articulation, by contrast, involves an accompanying stricture of lesser degree that modifies the primary one without altering its core manner or place, as in the labialized bilabial stop [pʷ], where lip rounding adds a simultaneous but less constricted gesture.^[3] This distinction relies on a hierarchy of stricture degrees, where the primary articulation imposes the narrowest obstruction to airflow, and the secondary one introduces a secondary resonance or approximation, such as tongue body raising or lip protrusion.^[3] Classifying articulations as primary or secondary can present challenges, particularly in cases where strictures are comparably prominent, leading to blurred boundaries. For instance, alveolo-palatal consonants like [t͡ɕ] often involve simultaneous alveolar and palatal constrictions, with linguopalatal contact data showing variable fronting degrees across languages that complicate assigning a dominant primary place.^[7] Such sounds may exhibit symmetry in articulation manner—e.g., affricates and nasals sharing similar places—challenging traditional criteria and suggesting a need for revised classifications like distinct alveolo-palatal categories.^[8] Additionally, distinguishing true secondary articulation from consonant clusters or anticipatory co-articulation is problematic, as clusters like stop + approximant sequences can mimic simultaneous gestures through overlap, whereas secondary articulation requires integrated, non-sequential articulator involvement.^[9] Theoretical models address these issues by framing articulations as overlapping gestures in articulatory phonology. Catford's framework emphasizes simultaneous multi-articulator actions, where the primary stricture dominates but secondary ones, such as tongue body advancement for palatalization, contribute concurrently without equal prominence. This approach, illustrated through schematic diagrams of articulator trajectories, highlights how secondary gestures modify resonance tracts additively, aiding differentiation from sequential clusters or double articulations with balanced strictures.^[10]

Types

Labialization

Labialization refers to a secondary articulation in which the lips form an additional stricture through rounding or protrusion, superimposed on the primary oral constriction produced by the tongue or other articulators. This process typically involves compression or pursing of the lips, creating a concomitant labial gesture that modifies the primary sound without altering its main place of articulation. For instance, in the consonant [kʷ], the primary velar closure at the back of the tongue is accompanied by lip rounding, resulting in a simultaneous velar and labial configuration. This type of secondary stricture is particularly prevalent in Northwest Caucasian languages, such as Adyghe and Abkhaz, where labialization serves as a phonemic feature distinguishing series of consonants.^[11]^[12] Acoustically, labialization is characterized by a lowering of the second formant (F2), primarily due to the lengthening of the front vocal tract cavity caused by lip protrusion and rounding, which reduces the resonant frequency. This F2 depression can be substantial, with studies showing decreases of up to 681 Hz in high vowels like and 480 Hz in low vowels like , enhancing perceptual contrast with non-labialized counterparts. In Salish languages, such as Montana Salish, labialized consonants like [tʷ] exhibit notably lower F2 values in adjacent vowel transitions compared to plain , contributing to their distinct auditory profile and aiding in phonemic differentiation.^[13]^[14]^[15] Phonetically, labialization varies in degree, ranging from weak (subtle lip compression with minimal protrusion) to strong (prominent rounding and extension, often approaching a full labial closure). Weak labialization may appear allophonically in contexts like pre-rounded vowels, while strong forms are more likely in phonemic systems with robust contrasts, as observed in languages like Na-Wuri where contextual factors influence the intensity of the lip gesture. Historically, labialization played a key role in the development of labio-velars in Proto-Indo-European (PIE), such as *kʷ, *gʷ, and *gʷh, which likely arose from plain velars followed by rounded vowels like *u or *o, leading to delabialization or shifts in daughter languages like Sanskrit and Greek.^[16]

Palatalization

Palatalization involves a secondary articulation where the tongue body is raised and fronted toward the hard palate, creating an approximant-like stricture in addition to the primary constriction of the consonant.^[17] This gesture typically affects coronals and dorsals, as seen in the production of [tʲ], where the alveolar primary place remains while the palatal secondary place adds fronting and raising of the tongue body.^[18] In Romanian fricatives, for instance, palatalized forms exhibit significantly greater anterior tongue raising (up to 8.5 mm for labials) and posterior tongue fronting compared to plain variants, confirming the secondary palatal stricture across consonant types.^[18] This secondary articulation is widespread in Slavic languages, such as Russian and Bulgarian, where it contrasts "soft" palatalized consonants with "hard" plain ones, and in Asian languages like Korean, Japanese, and Mongolian, often triggered morphophonologically.^[19] A crosslinguistic survey of 117 languages identifies secondary palatalization in 32 cases, predominantly involving coronals (27 instances) and dorsals (9 instances), with Slavic and Asian families showing high prevalence due to historical vowel influences.^[19] Acoustically, palatalization is cued by raised second (F2) and third (F3) formants during consonant-vowel transitions, distinguishing it from plain consonants.^[20] In Russian, for example, palatalized [tʲ] before a vowel like /a/ shows F2 and F3 loci exceeding 2000 Hz with a brief initial rise followed by decay, whereas plain exhibits lower onsets and simpler exponential transitions, as revealed in spectrograms of formant trajectories.^[20] These patterns enhance perceptual contrast, with F2 height serving as a dominant cue for Russian speakers.^[21] Variations in palatalization intensity can lead to affrication, where strong secondary gestures extend the fricative release, producing sounds like [t͡ʃ] in certain dialects.^[22] In northern and central Russian dialects, palatalized dentals before /i/ often affricate as [d͡ʒi], amplifying the contrast with velarized plain forms and reflecting dialectal strategies for dispersion.^[22] Diachronically, palatalization frequently evolves from vowel harmony systems, shifting to secondary articulation agreement across consonants.^[23] In Turkic Karaim, original vowel harmony triggered long-distance palatalization that solidified as consonant agreement, a trajectory observed in related Asian languages.^[23] Unlike primary palatal consonants, which shift the main stricture to the palate, secondary palatalization preserves the original place while adding the palatal gesture.^[24]

Velarization and Pharyngealization

Velarization is a secondary articulation in which the back of the tongue is raised toward the velum, creating a velar constriction alongside the primary articulation of a consonant. This involves retraction of the tongue root and elevation of the posterior tongue body, which reduces the volume of the posterior oral cavity.^[25] Acoustically, velarization is characterized by a lowered second formant (F2) around 1000 Hz and an elevated first formant (F1), resulting from the tongue's retracted position that perturbs the resonance of the vocal tract.^[25] Pharyngealization, another retracted secondary articulation, involves constriction of the pharynx through retraction of the tongue root and lowering of the larynx, often accompanied by epiglottal involvement. In some analyses, particularly for Semitic languages, pharyngealization may co-occur with velar elements, forming a combined velar-pharyngeal stricture due to the overlapping articulatory gestures in the posterior vocal tract. Acoustically, it lowers both F1 and F2 in adjacent vowels, with F2 reductions more pronounced than in pure velarization, reflecting the greater posterior constriction.^[26] A classic example of velarization is the dark lateral approximant [ɫ] in English, where the coda /l/ in words like "feel" features tongue root retraction, contrasting with the clear in onset positions like "leaf," which lacks this secondary stricture and shows higher F2 values.^[25] In Irish, velarization is contrastive across all consonants, as in [lˠ] versus [lʲ], with ultrasound data revealing significant tongue body backing for velarized variants, such as in "bán" [bˠaːnˠ] 'white' compared to palatalized forms.^[27] For pharyngealization, Arabic emphatic consonants like [tˤ] in "ṭālib" 'student' involve pharyngeal narrowing and tongue root retraction, producing a "dark" timbre with uvular vibration in some dialects, distinct from plain in "tālib" 'seeker.' These emphatics spread their pharyngealization to neighboring vowels, backing /a/ to [ɑ], as in emphatic [sˤɑːm] 'he fasted' versus plain [saːm] 'he priced.'^[26]

Transcription

IPA Conventions

In the International Phonetic Alphabet (IPA), secondary articulations are primarily notated using superscript symbols or diacritics attached to the primary articulation symbol, allowing precise representation of simultaneous articulatory features.^[28] For labialization, the superscript ʷ is placed after the base symbol, as in [kʷ] for a labialized velar stop.^[28] Palatalization employs the superscript ʲ, exemplified by [tʲ] for a palatalized alveolar stop.^[28] Velarization uses the subscript ˠ positioned below the base symbol, such as [lˠ] for a velarized alveolar lateral approximant, while pharyngealization applies the subscript ˤ, as in [tˤ] for a pharyngealized alveolar stop.^[28] These conventions, with diacritics standardized earlier but presented in the 2020 revision of the IPA chart (incorporating Unicode-compliant symbols for improved clarity and cross-platform consistency), remain current as of 2025. The 2020 revision updated the chart layout and added new symbols, though secondary articulation diacritics were unaffected.^[29] Secondary articulation notations extend to both consonants and vowels, adapting to their respective phonetic contexts. For consonants, they often indicate modifications to the onset, release, or entire closure, including cases like pre-nasalization notated with a superscript nasal symbol before the base, such as [ᵐb] for a prenasalized bilabial stop where the nasal component functions as a secondary articulation.^[28] On vowels, secondary features are typically represented as offglides or modifications, for instance [aʷ] to denote a vowel with labialized offglide, capturing the secondary rounding.^[28] This flexibility ensures that secondary articulations can be transcribed without altering the primary symbol's identity. When multiple secondary articulations co-occur, IPA conventions stack the diacritics in a conventional order following the base symbol, generally from most to least prominent or in the sequence of articulation from front to back. For example, [tʲˤ] represents a palatalized and pharyngealized alveolar stop, with ʲ superscripted above and ˤ subscripted below.^[28] Emphasis or additional prosodic details may incorporate further diacritics, such as stress marks or length symbols, but these remain subordinate to the core secondary notation to maintain transcriptional economy.^[28]

Historical and Alternative Notations

In the late 19th century, phonetic notations preceding the standardization of the International Phonetic Alphabet (IPA) relied on innovative systems to capture articulatory details, including what would later be termed secondary articulations. Henry Sweet, a prominent British phonetician, drew heavily from Alexander Melville Bell's Visible Speech system—introduced in 1867 as a visual representation of vocal tract positions—to develop his own transcription methods in works like A Handbook of Phonetics (1877). Sweet's approach emphasized articulatory configurations, using symbols that approximated organ positions to denote simultaneous gestures, influencing early efforts to represent secondary features such as lip rounding or tongue raising alongside primary constrictions.^[30] These pre-IPA notations often employed descriptive icons rather than abstract diacritics, prioritizing visibility for teaching and analysis. By the early 20th century, as phonetic transcription became more widespread, underletters emerged as a common convention for indicating secondary articulations in non-IPA systems and early IPA variants. For instance, the underhook ̫ was used below the primary symbol to denote labialization, as in [k̫] for a velar stop with simultaneous lip protrusion, appearing in publications by linguists like Daniel Jones and in American descriptive linguistics. This method allowed for compact representation of co-occurring articulations but faced challenges with typesetting and clarity, particularly for multiple secondary features.^[31] Such underletter diacritics reflected a transitional phase in phonetic notation, bridging visible speech icons and modern alphabetic systems.^[32] The IPA itself underwent significant revisions to refine secondary articulation notation. Early IPA charts from 1888 to the 1920s used small capital letters in parentheses or subscripts to mark secondary gestures, but these were inconsistent. The 1947 revisions standardized superscript letters for simultaneity, replacing underletters with symbols like ʷ (labialization) and ʲ (palatalization) placed above the primary consonant, as seen in updated charts that emphasized ease of printing and international adoption.^[32] This shift improved legibility and aligned with growing evidence from articulatory studies that secondary articulations are integral rather than additive. The 2015 IPA updates further extended these conventions, introducing refined tie bars (e.g., ͡ or ͜) for complex cases like [t͡ʷ], enabling precise depiction of overlapping primary and secondary strictures in narrow transcriptions.^[33] Beyond the IPA, alternative notations persist in specialized contexts. The Americanist phonetic alphabet (APA), developed by U.S. anthropologists and linguists around 1916, favors practical modifications for Native American languages, using digraphs or diacritics such as č for [tʃ] affricates, apostrophes for palatalization (e.g., t' for [tʲ]), and other marks for features like velarization, often avoiding IPA superscripts in favor of intuitive letter combinations. This system, detailed in early 20th-century handbooks, supports rapid fieldwork transcription where secondary palatalization or labialization is phonemically contrastive.^[31] In computational phonetics, Praat software, which includes articulatory synthesis capabilities, employs IPA-derived symbols and supports customizable diacritics in TextGrids, allowing users to annotate secondary articulations like velarization via scripted superscripts or tie bars for synthesis modeling. These tools facilitate quantitative analysis of secondary features in speech data.^[34]

Phonological Role

Influence on Sound Inventories

Secondary articulations play a crucial role in establishing phonemic contrasts within language sound systems, often creating minimal pairs that distinguish otherwise similar consonants. In Salishan languages, such as Montana Salish, labialization serves as a phonemic feature for uvular stops, contrasting plain /q/ with labialized /qʷ/; for instance, /qʷátsqʷən/ 'hat' differs from /qáɣeʔ/ 'aunt' primarily through this secondary articulation.^[15] Similarly, in Slavic languages like Russian, secondary palatalization creates robust contrasts across multiple consonant series, including stops and fricatives; minimal pairs include /bjit/ 'beaten' versus /bɨt/ 'way of life' and /tjikatʲ/ 'to tick' versus /tɨkatʲ/ 'to address in familiar form,' where the palatalized variants feature a raised tongue body as a secondary gesture.^[35] These secondary features contribute significantly to inventory expansion, particularly in languages with large consonant systems. Athabaskan languages exemplify this through multiple secondary series, such as labialized dorsals (/kʷ, ɡʷ, kʷ'/) alongside plain counterparts, which augment the overall consonant count to 30 or more per language while avoiding primary labials except in loans.^[36] Cross-linguistically, secondary articulations like palatalization and labialization appear in a substantial portion of languages, with Bhat's (1978) survey documenting over 120 instances of palatalization types, where secondary palatalization emerges as one of the most frequent forms, enhancing complexity in inventories without requiring new primary places.^[37] Typologically, secondary articulations often align with grammatical functions, such as marking diminutives through targeted palatalization. In Romance languages, this is evident in the Moldavian dialect of Romanian, where stem-final labials like /p/ undergo palatalization or alternation in diminutive formations to convey smallness or affection.^[19] Such patterns highlight a cross-linguistic tendency for secondary features to encode morphological categories, expanding functional roles beyond mere phonemic distinction.

Relation to Co-articulation and Assimilation

In articulatory phonology, secondary articulation is distinguished from co-articulation by its representation as the simultaneous execution of multiple gestures forming a single phonological unit, rather than the temporal overlap of independent gestures driven by sequential speech production. This model posits that secondary features, such as palatalization, arise from coordinated strictures where the secondary gesture (e.g., tongue body raising) occurs concurrently with the primary constriction, creating a unified articulatory event without requiring additional rules for phonetic realization. In contrast, co-articulation emerges from anticipatory or perseverative overlaps between adjacent gestures, such as the influence of a following vowel on a preceding consonant's tongue position, leading to context-dependent variations that are not inherently phonemic. Recent articulatory synthesis studies have refined this distinction, demonstrating through computational simulations how simultaneous gestures in secondary articulation maintain stable timing relations, while co-articulatory effects vary with speech rate and prosody.^[38] Secondary articulation also differs from assimilation, a phonological process where a sound adopts features from a neighboring segment, often regressively, without forming a complex single unit. For instance, in English, the nasal in "ink" assimilates to [ŋ] before the velar /k/, resulting in a sequential change rather than a simultaneous secondary velar feature on the nasal itself.^[39] Assimilation typically involves feature spreading across segments, whereas secondary articulation encodes the secondary stricture as an integral phonemic property of the primary consonant, as seen in languages like Russian where palatalized consonants contrast with non-palatalized ones independently of context.^[40] Diachronically, however, assimilation can phonologize into secondary articulation; velar softening before front vowels, initially an assimilatory co-articulatory effect, may stabilize as a secondary palatal feature or progress to primary palatalization, as evidenced in Romance languages where gestural blending between velars and high front glides leads to affricates like /tʃ/.^[39]^[40] Post-2018 research has addressed theoretical gaps in these relations through computational modeling, particularly neural networks that simulate secondary articulation effects by integrating phonological features with articulatory dynamics. For example, models using feature-based neural architectures have replicated simultaneous strictures in secondary palatalization, distinguishing them from assimilatory spreading in sequence processing tasks.^[41] In endangered languages like Tashlhiyt Berber, kinematic and acoustic simulations have quantified pharyngealization as a secondary gesture, revealing how it interacts with assimilation in low-resource phonetic inventories without requiring large datasets.^[42] These approaches highlight ongoing challenges in modeling the transition from phonetic co-articulation to phonologized secondary features, emphasizing the need for gesture-level representations in neural simulations.^[41]

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