Abstract
Units in the inferior colliculus of barbituate anesthetized cats were recorded with metal microelectrodes. 100-msec tone bursts of varied frequencies and intensites were used to generate frequency-time raster displays of unit responsiveness to sounds at the two ears. In addition, continuous tones of swept frequency and intensities sinusoidally modulated over 12 dB in or out of phase at the two ears served to estimate unit selectivity to time-varying sound parameters. Most units responding to tone bursts also responded to tones of changing frequency or intensity or both. Asymmetrical ranges of frequency responsiveness depending on the direction of frequency sweep and different ranges of frequency responsiveness for ipsi- and contralateral ears characterized some units. While contralateral facilitation was predominant, ipsilateral input was found to facilitate, inhibit, or have no effect for different units. The encoding of locus versus change of locus of sound sources was examined by means of the interaural intensity modulation. [Research supported by grants from the National Institute of Neurological Diseases and Stroke and Academic Senate, University of California at Santa Barbara.]
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