Monaural and Binaural Processing of Complex Waveforms
Annual technical rept. 1 Nov 1991-31 Oct 1992
CONNECTICUT UNIV HEALTH CENTER FARMINGTON
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Data were collected concerning the amount of comodulation masking release CMR obtained when coherent envelope information is presented successively rather than simultaneously. It was determined that off-frequency information, which produces a CMR, can provide only a small release from masking when presented prior and subsequent to the temporal interval containing the signal. Three papers were published and a fourth is undergoing revision. One assessed sensitivity to interaural correlation of the envelope of high-frequency waveforms and whether such sensitivity might account for detectability in an MLD paradigm. Another showed sensitivity to antiphasic sinusoids added only to the envelopes of high-frequency bands of noise as a function of the frequency of the sinusoid and the bandwidth of the masker. A third, with Dr. R. M. Stem, depicts how straightness weighting can be accomplished by a second, physiologically demonstrated, stage of neural processing. The complex, cross-correlation-based model was extended to account for how interaural insensitive disparities in combination with interaural temporal disparities affects lateralization. Software was written for experiments concerning effects of forward masking fringes on the high-frequency MLD and to perform the theoretical analyses of stimuli used in the successive CMR paradigm.... CMR, Cross-correlation, Generation of complex digital stimuli, Interference, Masking, M.L.D., Off- frequency cuing.