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Subcomponent cues in binaural unmasking

Culling, John Francis ORCID: 2011. Subcomponent cues in binaural unmasking. Journal of the Acoustical Society of America 129 (6) , pp. 3846-3855. 10.1121/1.3560944

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The addition of a signal in the N0Sπ binaural configuration gives rise to fluctuations in interaural phase and amplitude. Sensitivity to these individual cues was measured by applying sinusoidal amplitude modulation (AM) or quasi-frequency modulation (QFM) to a band of noise. Discrimination between interaurally in-phase and out-of-phase modulation was measured using an adaptive task for narrow bands of noise at center frequencies from 250 to 1500 Hz, for modulation rates of 2–40 Hz, and with or without flanking bands of diotic noise. Discrimination thresholds increased steeply for QFM with increasing center frequency, but increased only modestly for AM, and mainly for modulation rates below 10 Hz. Flanking bands of noise increased thresholds for AM, but had no consistent effect for QFM. The results suggest that two underlying mechanisms may support binaural unmasking: one most sensitive to interaural amplitude modulations that is susceptible to across-frequency interference, and a second, most sensitive to interaural phase modulations that is immune to such effects.

Item Type: Article
Status: Published
Schools: Psychology
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Additional Information: Portions of this work were presented at the International Symposium on Hearing in Salamanca, Spain, and appeared in The Neurophysiological Bases of Auditory Perception (Springer, New York, 2010).
Publisher: Acoustical Society of America
ISSN: 0001-4966
Last Modified: 11 Oct 2023 19:22

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