Some response characteristics of cells of the magnocellular division of the medial geniculate body of the cat

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Abstract
Extracellular recordings were made from single units in the magnocellular division of the medial geniculate body of the cat. The stimuli most frequently used were auditory clicks repeated at varying rates and intensities. Somatosensory stimuli were also used to reveal the presence of polysensory units. The response characteristics for most of the cells of the magnocellular division differed from those of the principal division under similar experimental conditions. A difference was noted between the responses obtained from animals which were anesthetized with chloralose and those anesthetized with sodium pentobarbital. It is suggested that the magnocellular division of the medial geniculate body may be divided into two regions, an anterior region which is primarily somatosensory in function and a posterior region which is primarily auditory in function.

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