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The effects of low- and high-frequency suppressors on psychophysical estimates of basilar-membrane compression and gain.

Yasin, Ifat and Plack, Christopher J. (2007) The effects of low- and high-frequency suppressors on psychophysical estimates of basilar-membrane compression and gain. Journal of the Acoustical Society of America, 121 (5). pp. 2832-2841.

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Abstract

Physiological studies suggest that the increase in suppression as a function of suppressor level is greater for a suppressor below than above the signal frequency. This study investigated the pattern of gain reduction underlying this increase in suppression. Temporal masking curves (TMCs) were obtained by measuring the level of a 2.2-kHz sinusoidal off-frequency masker or 4-kHz on-frequency sinusoidal masker required to mask a brief 4-kHz sinusoidal signal at 10 dB SL, for masker-signal intervals of 20–100 ms. TMCs were also obtained in the presence of a 3- or 4.75-kHz sinusoidal suppressor gated with the 4-kHz masker, for suppressor levels of 40–70 dB SPL. The decrease in gain (increase in suppression) as a function of suppressor level was greater with a 3-kHz suppressor than with a 4.75-kHz suppressor, in line with previous findings. Basilar membrane input-output (I/O) functions derived from the TMCs showed a shift to higher input (4-kHz masker) levels of the low-level (linear) portion of the I/O function with the addition of a suppressor, with partial linearization of the function, but no reduction in maximum compression.

Item Type: Article
Journal or Publication Title: Journal of the Acoustical Society of America
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Departments: Faculty of Science and Technology > Psychology
ID Code: 838
Deposited By: Professor Christopher Plack
Deposited On: 14 Dec 2007 16:32
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 18:22
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/838

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