Frisch, S. A. & Wright R. (2002). The phonetics of phonological speech errors: An acoustic analysis of slips of the tongue. Journal of Phonetics, 30,139–162.
Presentation: Sarah
Summary: Shelly
This study examines speech errors by acoustic analyses, which can solve the problem of being blind to gradient errors by the transcriptional approach, or the over-interpretation due to unexpected muscle activities by the instrumental approach. Four tongue twisters containing words and non-words were made to induce speech errors between /s/ and /z/. Duration, frication amplitude and percent voicing of the target fricatives were measured to check how correct the token was produced. Results revealed that gradient errors do occur in percent voicing. However most of the voicing patterns still cluster around no voicing or nearly full voicing, indicating that such errors are still categorical. There is also a lexical effect, showing that real words elicit more errors in this task, which implies that these errors are easier to take place when they are competing with other words in our mental lexicon. The above findings suggest that our pronunciation gestures are organized categorically with permissible words. The categorical tendencies of speech production can thus be concluded for the present study.
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