Abstract

Comodulation masking release (CMR) suggests that the auditory system is sensitive to across‐frequency differences in modulation pattern. This raises the question of whether it is as sensitive to modulation differences due to the absence of activity (a silent interval) as it is to the presence of additional activity (a signal). If so, gap detection in a narrow‐band noise would be expected to be better in the presence of a comodulating flanking band than in the presence of a noncomodulating flanking band. The present study was designed to test this hypothesis. Gap detection was measured in a 30‐Hz‐wide narrow‐band noise centered at 1 kHz. A second 30‐Hz band of noise, centered at either 500 Hz or 1.5 kHz, was then added that was either comodulated or noncomodulated with the 1‐kHz band. While gap detection deteriorated with the addition of a second noise band, it appeared to do so more for the noncomodulated case than for the comodulated case. [Research supported by AFOSR.]

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