When members of a series of synthesized stop consonants varying acoustically in F3 characteristics and varying perceptually from fdaf to fgaf are preceded by fall, subjects report hearing more fgaf syllables relative to when each member is preceded by farf (Mann, 1980).It has been suggested that this result demonstrates the existence of a mechanism that compensates for coarticulation via tacit knowledge of articulatory dynamics and constraints, or through perceptual recovery of vocal-tract dynamics. The present study was designed to assess the degree to which these perceptual effects are specific to qualities of human articulatory sources. In three experiments, series of consonant-vowel (CV)stimuli varying in F3-onset frequency (/daf-fgal) were preceded by speech versions or nonspeech analogues of fall and lest. The effect of liquid identity on stop consonant labeling remained when the preceding VC was produced by a female speaker and the CV syllable was modeled after a male speaker's productions. Labeling boundaries also shifted when the CV was preceded by a sine wave glide modeled after F3 characteristics of fall and farf. Identifications shifted even when the preceding sine wave was of constant frequency equal to the offset frequency of F3 from a natural production. These results suggest an explanation in terms of general auditory processes as opposed to recovery of or knowledge of specific articulatory dynamics.Despite 40 years of sustained effort to develop machine speech-recognition devices, no engineering approach to speech perception has achieved the success ofan average 2-year-old human. One of the more daunting aspects of speech for these efforts is the acoustic effects of coarticulation. Traditionally, coarticulation refers to the spatial and temporal overlap of adjacent articulatory activities. This is reflected in the acoustic signal by severe context dependence; acoustic information specifying one phoneme varies substantially, depending on surrounding phonemes. As a result, there is a lack ofinvariance between linguistic units (e.g., phonemes, morphemes) and attributes of the acoustic signal. This poses quite a problem for speech-recognition devices which are designed to output strings of phonemes. ' An example of coarticulatory influence is the effect of a preceding liquid on the acoustic realization of a subsequent stop consonant. Mann (1980) reports that articulation of the syllables fdal and Igal may be influenced by the production of a preceding lall or lar/. Articulatorily described, the physical realization of the phonemes Idl and Igl primarily differ in the place at which the tongue occludes the vocal tract. For a velar stop [g], the tongue body is raised against the soft palate at the rear of the mouth, whereas for an alveolar stop [d], the tongue tip comes in contact with the alveolar ridge toward the front ofthe oral cavity behind the teeth. The liquids III and Irl differ in a similar manner; an [r] is produced with the tongue raised toward the rear of the cavity, and an [1] is produce...