Abstract
The pioneering work of Robert Capranica in sound communication in bullfrogs revealed that sound pattern recognition involves a nonlinear operation. He showed in 1965 that, for bullfrogs, although the peripheral auditory system exhibits nonlinear properties, nonlinearity of the central auditory system is necessary for sound perception. Researchers studying sound processing in anurans as well as in birds and mammals have since shown that central auditory processing underlying various perceptual tasks (e.g., localization, ranging, and pattern recognition) mostly involves nonlinear operations; these are time- or frequency-dependent or both. Signal detection and discrimination in noise is another example. Frogs exhibit spatial unmasking, a space-dependent phenomenon, i.e., the masking effect is reduced when signal and noise sources are spatially separated. Spatial unmasking allows frogs to communicate effectively by sound in a dense chorus. Recent physiological evidence showed that spatial unmasking is largely attributed to nonlinear binaural processing in the CNS. The auditory periphery contributes to spatial unmasking but the processing therein is largely linear and its role is more limited. [Work supported by NIH/NIDCD.]
Published Version
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