Abstract
APART from visual responses1, somesthetic responses have been repeatedly observed in the superior colliculus2. We have previously reported that under chloralose anaesthesia the somesthetic responses to forelimb stimulation recorded with gross concentric electrodes could be divided into a short-latency group (9 ms) and a long-latency group (70 ms), and that long-latency responses disappeared after ablation of the visual cortex3. This indicated a convergence of two somesthetic pathways towards the collieulus, as well as a convergence of somesthetic and visual afferent pathways. A microelectrode analysis has been undertaken in order to determine the extent of these convergences at the cellular level.
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