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Subcomponent cues in binaural unmasking

Culling, John Francis ORCID: 2010. Subcomponent cues in binaural unmasking. Lopez-Poveda, E. A., Palmer, A. R. and Meddis, R., eds. The Neurophysiological Bases of Auditory Perception, London: Springer, pp. 247-255. (10.1007/978-1-4419-5686-6_23)

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The roles of fluctuations in interaural amplitude and phase in binaural unmasking were separated experimentally and examined as a function of frequency. Narrow bands of noise (1 ERB wide) with a range of centre frequencies (250-1,500 Hz) and of 500-ms duration were sinusoidally modulated at 20 Hz using either amplitude or quasi-frequency modulation (AM or QFM). In a two-interval, forced-choice task, modulation was applied in both intervals, interaurally out of phase in the signal interval and in phase in the non-signal interval. To emulate a narrow-band binaural unmasking task, the bands were used in isolation. To emulate a broadband unmasking task, flanking bands of diotic noise were added, but separated from the target band by 1-ERB-wide notches. Discrimination thresholds for narrowband AM were roughly constant as a function of frequency. However, AM with flanking bands displayed higher thresholds that increased with frequency, suggesting the presence of a cross-frequency interference effect. QFM produced a quite different data pattern, suggesting the operation of a different mechanism. Thresholds were lower than for AM up to 500 Hz, but increased sharply with frequency, and there was no effect of the flanking bands.

Item Type: Book Section
Date Type: Publication
Status: Published
Schools: Psychology
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Uncontrolled Keywords: Unmasking; Modulation; Non-linearity; Binaural interference
Publisher: Springer
ISBN: 9781441956859
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Last Modified: 18 Oct 2022 12:53

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