| Abstract | Five experiments, with a total of 46 undergraduates, examined the effects of various acoustic manipulations on the 2 percepts (speech vs nonspeech "chirp") of duplex perception. Findings revealed that ipsilateral backward masking of the transition and decreasing transition intensity had more of a disruptive effect on the chirp side than on the speech side. In contrast, a temporal asynchrony between base and transition and a mask that was ipsilateral to the base had marked effect on the speech side but left the chirp side unimpaired, providing evidence of a double dissociation. This evidence confirms the separability of the 2 forms of perception and supports the contention that speech and nonspeech auditory stimuli are processed differently. |
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