Culling, John Francis  ORCID: https://orcid.org/0000-0003-1107-9802
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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Abstract
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 |
| Related URLs: | |
| Last Modified: | 18 Oct 2022 12:53 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/11514 |
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