Abstract
The anticipation of articulatory features, in particular, lip rounding in anticipation of a rounded vowel, has been reported to occur as many as four segments before the segment for which the feature is specified. Recently we reported [F. Bell-Berti and K. S. Harris, J. Acoust. Soc. Am. 60, S63(A) (1976)] that the motor commands for the rounding gesture for /u/ begin a fixed time before voicing onset for the vowel. This timing is unaffected by the number of preceding consonant segments or the location of syllable boundaries in the preceding string. Thus, the initiation of lip rounding appears to be linked to other features of the vowel articulation, much as movement of the velum has been shown to be linked to lingual articulation [R. D. Kent, P. J. Carney, and L. R. Severeid, J. Speech Hearing Res. 17, 470–488 (1974)]. Analysis of these and additional data lead us to postulate a system of motor organization which is segment rather than feature based. [Work supported by NINCDS grant NS 13870, NIDR grant DE 01774, and NINCDS postdoctoral fellowship 1 F32 NS 05332-01A1.]
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