Abstract
We present here a model which simulates some recent findings [S. Kuwada et al., Science 206, 586–588 (1979); S. Kuwada et al., Neurosci. Abstr. 76 (1979)] in which the interaural phase sensitivity of inferior colliculus neurons has been studied using interaural delays or binaural beats. The cyclic response patterns of some neurons are altered systematically as a function of stimulus off-time and interaural intensity differences. In addition, the response to binaural beat stimuli indicates that some cells are sensitive to the direction of interaural phase change. The model is comprised of two inputs (one from each ear), each with crossed collateral inhibition. The two inputs synapse on a third cell, resulting in four synaptic connections; two inputs are presynaptic inhibitory and two are direct excitatory. At each junction, simple rules about transmitter release, transmitter supply, and changes in membrane potential are made. Manipulation of these parameters allows for simulation of the commonly seen cyclic response pattern as well as some of the unique effects of off-time, interaural intensity differences, and sensitivity to a particular direction of interaural phase change. [Supported by NIH grant NS12732.
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