Abstract
The purpose of this paper was to investigate whether voice onset time differences occurred among speakers exhibiting four different types of dysarthia. Twenty dysarthic speakers were used as subjects: five spastic, five flaccid, five ataxic, and five hypokinetic. Repeated utterance tasks using /pΛ/, /tΛ/ and /kΛ/ were analyzed using spectrography. All the speakers exhibited phonetic errors in their voice onset time productions, with voice onset times occuring in the range of values between voiced and voiceless stops. The spastic speakers exhibited shortest voice onset times while the flaccid and ataxic speakers exhibited significantly more voice onset time variability than the spastic and hypokinetic speakers. The short voice onset times exhibited by these speakers were related to the physiologic demands of voiceless stop productions.
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