Abstract
Performance-intensity functions for synthetic sentences were defined in the presence of two competing signals. One was a competing speech message. The second was a noise envelope obtained by multiplying white noise and the amplitude envelope of the competing speech message that was full-wave rectified and low-pass filtered to 20 Hz. The two competing signals had nearly identical temporal masking patterns, but the noise envelope was devoid of all other speechlike properties. Mean sentence identification scores were higher for the noise envelope condition. Threshold levels (S/N ratio corresponding to 50% correct) were −29 dB for competing speech and −36 dB for the noise envelope. The area under the function for the noise envelope was approximately 22% greater than the area for competing speech. The disruptive influence of (1) the random temporal masking pattern and (2) the speechlike properties of the competing message will be discussed. The results will be compared with previous experiments in which competing messages were presented in forward and backward modes. [Research supported by grants from National Institutes of Health and University of Minnesota Graduate School.]
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