Abstract

When reading the review literature regarding directional hearing or sound source localization by fishs, one usually sees a list of reasons why fish cannot use binaural cues. The assumptions are that teleost fishs cannot detect left versus right differences in arrival times (due to the speed of sound in water), amplitude differences (due to the closeness of the ears and the acoustic transparency of the tissues), nor phase differences (due to the long wavelengths of the frequencies most fish can hear best). However, there is some behavioral evidence that fishs can distinguish the direction of a sound source, if not the actual location. We will present evidence that there are potential binaural cues that might be available given left versus right differences in auditory input to the brain that are the result of both anatomical organization and physiological mechanisms. In addition, sharpened directional responses are present in the medulla and the midbrain, which are likely to be due to binaural computations. [Work funded by the National Institutes of Health, NIDCD.]

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