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A Temporal Order Effect in Voice Onset Time Discrimination

In two experiments ten adults were required to discriminate between synthetic speech stimuli varying in voice onset time. The stimuli included labial and velar stops. The data, analysed, using ANOVA and post hoc comparison techniques, indicated that while adult phoneme perception was categorical, it was also asymmetrical. Discrimination of VOT changes from voiceless to voiced stimuli was significantly better than detection of voiced to voiceless changes. The data are interpreted as supporting a theory that VOT perception is mediated by a dual feature detector mechanism.