Abstract
As reported previously [Porter and Castellanos, J. Acoust. Soc. Am. 61, S91–S92(A) (1977)] subjects shadow (rapidly imitate) a VCV in approximately 225 ms (measured from stimulus closure to response closure). However when subjects produce the CV /ba/ to the same VCV tape, reaction times increase by over 10 ms (measured from stimulus closure to response release.) To determine whether this asymmetry reflects a perceptual constraint or a motor system limitation, or both, subjects were asked to (1) shadow both a VCV and CV tape, (2) “shadow” the initial vowel in the VCV with a continuing labial nasal /m/ and release the closure to a vowel upon hearing the consonant, (3) respond with a CV to VC stimuli, and (4) respond with a VC to CV stimuli. Results suggest that the majority of the “additional” time is required for the initiation of glottal pulsing and motor system organization. [Work supported by NIH.]
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