Abstract
In this study we sought to validate physiologically the hypothalamus afferent projections from the auditory thalamus previously identified with tract tracing techniques in the ring dove. In total, we recorded the responses of 628 units in the nucleus ovoidalis (Ov) and its shell region to electrical stimulation applied to anterior hypothalamus and ventromedial nucleus. Ninety-six acoustic units in the shell region displayed good antidromic responses, confirming this region's axonal projections into these nuclei of the hypothalamus. Orthodromic responses (143 units) recorded in the Ov-Ov shell region suggest on the other hand reciprocal projections from the hypothalamus back to the auditory thalamus.
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