Abstract
In the previous paper (1-4), we have been able to demonstrate systematically the relationship between the cortical auditory responses evoked by clicks and the level of consciousness in the acute encéphale isolé preparations of cat. Furthermore, the effects of several central depressants on the evoked responses in the central auditory system caused by single and repetitive click stimuli have been studied in the acute preparations. Although the auditory responses in unanesthetized, unrestrained animals have been observed by several investigators (5-9), influence of the central depressants on these responses is not fully elucidated. In the present report, we have designed to compare the effects of central depressants on the cortical evoked responses caused by clicks in unrestrained chronic preparations of cat with those in acute ones.
