Auditory filter bandwidths are measured for a temporal process using an amplitude-modulation detection task. The first two experiments investigate the effects of center frequency and intensity on the detectability of sinusoidally amplitude-modulated noise centered within an unmodulated notched-noise masker. A modulation rate of 10 Hz is used to avoid possible information loss at more central processing levels for high modulation rates. Threshold functions are obtained for 10-14 notch widths for each of four different center frequencies (0.6, 1, 2, and 4 kHz), and at three intensity levels (40, 60, and 85 dB) to determine the maximum notch width at which the masker has an effect. The ratio of center frequency to maximum notch width is approximately 2 at all center frequencies and intensities. It is proposed that the wider bandwidths consistently observed in temporal tasks be characterized as "temporal critical bands," which do not oppose but provide a complement to the traditional critical band obtained in tasks involving spectral discrimination. The last experiment examines the effects of bandwidth on the results from the prior experiments in order to verify that the measurements truly reflect bandwidths for processing temporal information.
|Advisor:||Berg, Bruce G.|
|Commitee:||Richards, Virginia M., Saberi, Kourosh|
|School:||University of California, Irvine|
|Department:||Psychology - Ph.D.|
|School Location:||United States -- California|
|Source:||DAI-B 74/05(E), Dissertation Abstracts International|
|Subjects:||Psychology, Cognitive psychology|
|Keywords:||Amplitude-modulation detection, Leaky integrators, Notched-noise, Peripheral auditory systems, Temporal processing|
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