Binaural Masking: An Analysis of Models
Final technical rept. 1 Apr 89-31 Jan 91,
CENTRAL INST FOR THE DEAF ST LOUIS MO
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The goal of this program of research has been to specify auditory processing in the presence of noisy backgrounds. A variety of experimental and modeling approaches have been employed to examine this processing. Overall the results suggest the importance of spectral and temporal comparisons in signal detection and suggest that similar processing underlies monaural and binaural detection. The introduction of masker energy in temporal intervals that did not overlap with the signal could be shown to either enhance or degrade detection performance, depending on the interaural parameters of the stimuli. Experiments on remote masking and suppression showed excitatory and inhibitory effects that extended across more than an octave. These results are being used to evaluate a nonlinear model of cochlear processing. The responses of subjects to individual stimuli reproducible noise samples were highly correlated between monaural and binaural conditions that had seemed dramatically different when the ensemble performance was considered i.e., data averaged across noise samples.