Abstract
Measures of temporal acuity reveal a remarkable ability to integrate temporal information across frequency throughout most of the audible spectrum. This apparent trading of spectral bandwidth and temporal resolution was investigated in three different experiments measuring amplitude-modulation detection, temporal gap detection, and intensity discrimination. Each experiment included six spectral conditions: a single band of noise 1600-Hz wide centered at 3000 Hz; a set of four noise bands 400-Hz wide having center frequencies separated by 1200 Hz (1200, 2400, 3600, 4800 Hz); and four conditions composed of only one of the four 400-Hz bands. The form of the modulation transfer functions did not depend upon total bandwidth or frequency region. Sensitivity to modulation was inversely related to total noise bandwidth. Temporal gap detection thresholds and intensity discrimination were strongly dependent upon total noise bandwidth but were independent of the spectral proximity and the center frequency of the noise bands. Analysis of the three experiments revealed that the inverse relation between intensity discrimination and noise bandwidth may be used to predict the variation in amplitude modulation and temporal gap detection thresholds with noise bandwidth.
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