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Journal of Speech and Hearing Research Vol.36 466-471 June 1993.
© American Speech-Language-Hearing Association
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Changes in Auditory-Vocal Reaction Times Within and Across Experimental Sessions

Preliminary Observations

Shimon Sapir 1
Ligang Li 1
Ann B. Ragin 2

James M. Dod 2
1 Northwestern University Evanston, IL
2 Evanston Hospital Evanston, IL

Changes in auditory-vocal reaction times (AVRTs) within and across experimental sessions were studied in 13 healthy university students, all females. Subjects were required to listen to a series of synthesized vowels and utter each of the vowels as soon as they heard it. The vowels were /i/, /u/, /a/, /o/, and /æ/, each presented 14 times and all presented in random order and at irregular intervals (2.5–4.5 sec). The stimuli and the instructions were prerecorded and presented to the subjects binaurally at a comfortable intensity level via headphones in an IAC booth. Each subject performed the experimental task twice, a week apart. The stimuli and the vocal responses were tape recorded and later digitized and computer analyzed. Serial analysis of successive AVRTs revealed significant intra- and intersession decreases in AVRTs in the majority of the subjects. Increases in AVRTs were also seen, but much less frequently. The implications of these findings are discussed.

KEY WORDS: voice reaction time, acoustic analysis, serial analysis of reaction times

Submitted on July 24, 1992
Accepted on December 7, 1992


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