Final rept. 1 Nov 89-31 Oct 90,
CONNECTICUT UNIV STORRS DEPT OF COMMUNICATION SCIENCES
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During the past year we have continued our experiments designed to study the role of cross-spectrum coherent frequency change on signal detection. We have studied the effects of frequency glides and frequency jitter on cross-spectrum fusion, specifically addressing the issues of maximum spectral distance and harmonic relationship between signal and masker, and have found that the improved detection which we reported last year cannot be solely attributed to either. We have spent considerable time developing two experimental paradigms to be used in our future studies of signal separation as it relates to separation of a direct sound from its echo. The results of initial experiments using these paradigms indicate that a signal following an identical waveform is considerably more difficult to detect than when it is leading that waveform. These results cannot be accounted for by traditional temporal masking. We have also continued our experiments using noise-problem people as subjects in an effort to determine if their ability to perform these tasks is related to their difficulty listening in background noise.