Detection of diotic and dichotic tones partially masked by noise was studied in the cat. The continuous noise masker was always diotic (N0). The single gated tone burst had a frequency of 0.5, 1.0, or 1.5 kHz, and was presented in phase (S0), 180° out of phase (Sπ), and monaurally (SM). The transducers were held in a fixed spatial relation to the auditory canal by means of “pinna inserts” and leather helmets. An avoidance response in a shuttle box was used to measure detectability. The cats displayed as large a release from masking in the Sπ condition at 1.0 and 1.5 kHz as at 0.5 kHz. At 1.5 kHz, the cats showed a greater release from masking than did the human observers studied under comparable conditions.

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