Abstract
Perception of the phonetic dimension stop vs continuant was studied by means of a selective adaptation procedure. Subjects first identified a series of synthetic consonant-vowel syllables which varied in duration of formant transitions: they were perceived as either /ba/ or /wa/. After the initial identification test, an adapting stimulus was presented repeatedly, and then the subjects again identified the original test series. Adapting with a stop (either /ba/ or /da/) led to a decrease in the number of test stimuli identified as /ba/, whereas adapting with the continuant sound /wa/ led to an increase in the number of /ba/ identifications. A reduction in the number of /ba/ identifications occurred even when a nonspeech stop sound (string pluck) was used as the adapting stimulus. Because the acoustic information specifying stop quality for this nonspeech stimulus was entirely different from that specifying stop quality for the test stimuli, it was concluded that the “stop detector” operates at a more abstract level than that of either a simple acoustic or phonetic analysis.
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