Detection of an In-Phase Signal with and without Uncertainty Regarding the Interaural Phase of the Masking Noise

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Abstract
The basis for detection in those interaural conditions that lead to a masking-level difference (MLD) is presumed to be quite different from that in the non-MLD conditions. This experiment examined the effect upon detectability when listeners were uncertain whether an MLD or a non-MLD condition was to be presented. Detectability was measured at 2 values of signal energy for each of 2 interaural conditions, NO-SO and N[pi]-SO. The "YES-NO" psychophysical method was used. On some blocks of trials, the blocks with "no uncertainty," only one interaural condition was presented. On other blocks of trials, the blocks "with uncertainty," NO-SO signals were mixed with equally detectably N[pi]-SO signals. The listeners were informed which type of block was to be presented. There was essentially no difference between the data obtained with uncertainty and those obtained with no uncertainty. A supplementary experiment showed that on the blocks with uncertainty the listeners were quite poor at identifying the type of noise presented on a trial.

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