Explanation
Coarticulation is the temporal overlap of articulatory movements belonging to neighbouring sounds. In speech, lips, tongue, jaw, and larynx do not wait for one segment to finish completely; they anticipate what follows and preserve effects of what came before. Lip rounding for a following vowel may therefore become visible and audible during the preceding consonant. Alphabetic writing makes sound sequences look like separate blocks, whereas coarticulation reveals production as continuous, anticipatory coordination. It is not careless pronunciation but a systematic property of fluent speech whose extent varies with phonetic environment, rate, prominence, and language. Listeners also exploit these distributed cues to predict upcoming sounds and segment the stream robustly.
Movement of thought
1. A sound sequence is first represented as a row of discrete segments ordered one after another in writing and phonological analysis. 2. The speech organs plan several gestures with temporal overlap, so one movement begins before a neighbouring segment is fully reached. 3. Acoustic properties of a segment consequently contain information about preceding or following sounds and their prosodic environment. 4. A counter-test controls rate, speaker, and context and separates systematic overlap from slips, reduction, or measurement artefact. 5. The sound stream returns as coordinated movement in which future and past articulation act together within the present signal.
Scientific use case
Experimental phonetics measures formants, spectra, and movement trajectories using ultrasound, electromagnetic articulography, or imaging. Perception tests ask how early listeners use coarticulatory cues to recognise upcoming sounds.
Example
In “cool,” many speakers begin rounding their lips during the initial consonant in preparation for the following /uː/; the upcoming segment is already visible and acoustically influential.
Counterexample
An isolated vowel held steadily without relevant neighbouring sounds exhibits an articulatory position but no overlap between adjacent gestures and therefore no case of coarticulation.
Distinction
Distinguish coarticulation from assimilation as a potentially categorical pattern, from general reduction, and from articulatory error. Coarticulation is regular temporal overlap, although it may provide material for later sound change.
Effect on thought and perception
Coarticulation challenges the image of neatly separated sound units and explains how fluent production remains efficient and perception becomes anticipatory.
Resonance
What is coming already acts within the current sound, while what has passed continues to reverberate; speech becomes a bodily stream across segment boundaries.
Cite this entry
Reich, Michael (Hrsg./ed.): „Coarticulation“. Atlas der Sprache, AT-PHO-W0066. ATLAS 260, data model 1.6.0. https://atlasoflanguage.com/concept/AT-PHO-W0066The address remains stable; editorial content may evolve. Editorial reading state: 2026-10-15. Include your access date for precise references.
Historical background
Sapir’s 1921 account describes speech sounds as results of several simultaneous articulatory adjustments rather than as indivisible acoustic objects. His discussion of English k in different vowel environments also recognises position-dependent differences that ordinary speakers may disregard. These passages provide historical background for analysing contextual interaction between articulations, but they do not establish that Sapir formulated the later technical concept of coarticulation under that name. The limitation matters: a documented observation of contextual variation is not yet a complete model of overlapping gestures in time. For the Atlas, the earlier description nevertheless helps explain why letters can suggest a misleading sequence of self-contained blocks. Actual speech production requires coordinated movements whose realisation depends on surrounding material. The specific historical examples and causal descriptions should be checked with contemporary phonetic work before serving as current evidence. A full history must follow the English term, experimental methods and competing models beyond this conceptual predecessor; none is silently attributed to the 1921 text.
How conceptual history changes the analysis
The specific historical examples and causal descriptions should be checked with contemporary phonetic work before serving as current evidence. A full history must follow the English term, experimental methods and competing models beyond this conceptual predecessor; none is silently attributed to the 1921 text.
References for the historical section
- Edward Sapir, Language: An Introduction to the Study of Speech (1921) · Chapter III, position of English k in kin and cool; simultaneous articulatory adjustments
Original English text read in the Gutenberg transcription. No first-coinage claim, full-book verification or automatic endorsement of the author’s 1921 language classifications and generalisations. Examples require modern descriptive checking before reuse as current language data.