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Monaural and binaural detection of sinusoidal phase modulation of a 500-Hz tone

Lookup NU author(s): Dr Gary Green, Professor Adrian ReesORCiD


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The detectability of phase modulation was measured for three subjects in two-alternative temporal forced-choice experiments. In experiment 1, the detectability of sinusoidal phase modulation in a 1500-ms burst of an 80-dB (SPL), 500-Hz sinusoidal carrier presented to the left ear (monaural condition) was measured. The experiment was repeated with an 80-dB, 500-Hz static (unmodulated) tone at the right ear (dichotic condition). At a modulation rate of 1 Hz, subjects were an order of magnitude more sensitive to phase modulation in the dichotic condition than in the monaural condition. The dichotic advantage decreased monotonically with increasing modulation rate. Subjects ceased to detect movement in the dichotic stimulus above 10 Hz, but a dichotic advantage remained up to a modulation rate of 40 Hz. Thus, although sound movement detection is sluggish, detection of internal phase modulation is not. In experiment 2, thresholds for detecting 2-Hz phase modulation were measured in the dichotic condition as a function of the level of the pure tone in the right ear. The dichotic advantage persisted even when the level of the pure tone was reduced by 50 dB or more. The findings demonstrate a large dichotic advantage which persists to high modulation rates and which depends very little on interaural level differences. (C) 2000 Acoustical Society of America.

Publication metadata

Author(s): Rees A; Green GGR; Witton C; Henning GB

Publication type: Article

Publication status: Published

Journal: Journal of the Acoustical Society of America

Year: 2000

Volume: 108

Issue: 4

Pages: 1826-1833

Print publication date: 01/01/2000

ISSN (print): 0001-4966

ISSN (electronic): 1520-8524

Publisher: Acoustical Society of America


DOI: 10.1121/1.1310195

PubMed id: 11051509


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