Related Experiment Video
Updated: Sep 16, 2026

Cross-Modal Multivariate Pattern Analysis
Published on: November 9, 2011
Duplex perception: some initial findings concerning its neural basis
J Cranney1, C A Fowler, F Musiek
1School of Psychology, University of New South Wales, Kensington, Australia.
Abstract:
Duplex perception is the simultaneous perception of a speech syllable and of a nonspeech "chirp," and occurs when a single formant transition and the remainder (the "base") of a synthetic syllable are presented to different ears. The current study found a slight but nonsignificant advantage for correct labeling of the fused syllable when the chirp was presented to the left ear. This advantage was amplified in the performance of a "split-brain" subject. A subject with a left pontine lesion performed at chance level when the chirp was presented to her left ear. These findings suggest that some, if not complete, ipsilateral suppression does occur in the dichotic fusion procedure, and that identification of the fused syllable is maximal when the left hemisphere fully processes the linguistic characteristics of the base (through contralateral presentation), and at least minimally processes the frequency transition information of the chirp (through ipsilateral presentation).
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