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Evidence specifically favoring the equalization-cancellation theory of binaural unmasking

Culling, John Francis ORCID: 2007. Evidence specifically favoring the equalization-cancellation theory of binaural unmasking. Journal of the Acoustical Society of America 122 (5) , pp. 2803-2813. 10.1121/1.2785035

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Three experiments investigated the roles of interaural correlation (ρ) and of the monaural power spectrum in the detection and discrimination of narrow-band-noise signals (462–539 Hz) in broadband maskers (0–3 kHz). The power and ρ of the target band were independently controlled, while the flanking noise was fixed and diotic. Experiments 1 and 2 involved ρ and power values that would be produced by specific values of signal-to-noise ratio (SNR) in the NoSπ binaural configuration. Listeners were required to discriminate different SNRs via a 2I-FC loudness-discrimination task. At low reference SNRs, changes in ρ fully accounted for listeners’ performance, but as reference SNR increased, additional energy in the target band played an increasing role. Experiment 2 showed that at these higher SNRs the combination of information from the power spectrum and ρ was superadditive and could not be explained by simple signal-detection models. The equalization-cancellation (EC) theory would explain these data using the output from interaural cancellation, Y, rather than ρ. Experiment 3 attempted to foil binaural processing, by fixing either ρ or Y across intervals. Consistent with EC theory, when Y was fixed, the contribution of the binaural system appeared negligible, while fixing ρ did not have this effect.

Item Type: Article
Status: Published
Schools: Psychology
Uncontrolled Keywords: acoustic noise; cognition; correlation methods; hearing; neurophysiology
Publisher: Acoustical Society of America
ISSN: 0001-4966
Last Modified: 18 Oct 2022 13:23

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