Abstract
A series of masking experiments was performed with the aim of comparing frequency selectivity of the binaural and monaural hearing systems. In these experiments, the masking stimulus contained both a sinusold, which was gated simultaneously with a 100-ms signal, and a continuous broad-band noise musket. The frequency of the tonal masker was varied while that of the signal was fixed at 500 Hz. Signal thresholds were obtained in a 3 ITFC paradigm with an updown adaptive procedure. In the first part of the experiment, the tonal musket was omitted and noise levels were selected so that signals in N0Sπ and NmSm conditions were equally detectable. When a tonal musket which was intense relative to the noise was subsequently introduced a comparison of masking functions obtained for N0M0Sπ, N0MπSπ, and NmMmSm, conditions (here “M” denotes the tonal masker) suggests that the binaural and monaural systems possess identical internal filters. However, a replication of the N0MπSπ and NmMmSm conditions with a low masker-to-noise ratio leads to a different conclusion: that the binaural system is less frequency selective than the monaural system. The implications of these results are discussed. [Work supported by the Neurobehavioral Sciences Program, University of Iowa.]
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