Duplex Perception: Some Initial Findings Concerning Its Neural Basis.
| Number | 692 |
|---|---|
| Year | 1989 |
| Drawer | 12 |
| Entry Date | 11/15/1999 |
| Authors | Cranney, J., Fowler, C., & Musiek, F. |
| Contact | |
| Publication | Brain and Cognition, 9, 48-56. |
| url | http://www.haskins.yale.edu/Reprints/HL0692.pdf |
| Abstract | Duplex perception, the simultaneous perception of a speech syllable and of a nonspeech "chirp," occurs when a single formant transition and the remainder (the "base") of a synthetic syllable are presented to different ears. The present study, with 34 undergraduates, found a slight 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 22-yr-old male "split-brain" S. A 33-yr-old Subject with a left pontine lesion performed at chance level when the chirp was presented to her left ear. Findings suggest that some, if not complete, ipsilateral suppression occurs in the dichotic fusion procedure. Also, 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). |
| Notes |
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