Abstract
In order to estimate the relative contribution of brain‐stem pathways to binaural interaction at the inferior colliculus, we severed the dorsal stria in anesthetized rats and examined binaural interaction at the inferior colliculus. Extracellular recording was contralateral to the lesion using monaural and binaural clicks of varying intensity as stimuli in order to access the suppression of firing usually caused by ipsilateral stimulation. Both averaging and categorization of cell responses indicated that they underwent a greater reduction of firing when stimulation of the ear ipsilateral to the recording site was added to contralateral stimulation than did unlesioned controls. Since cells from lesioned animals also had click thresholds that were higher than controls, and since this pathway has only minor, if any, projections to the region of binaural interaction in the superior olivary complex, our results suggest that binaural interaction seen at the inferior colliculus does not entirely mirror binaural integration performed at the superior olivary complex. The dorsal stria contributes to this interaction. [Work supported by NIH.]
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