Abstract
The behaviour of single units in the medial geniculate nucleus of the unanaesthetized unrestrained cat has much in common with that of units in auditory cortex, in terms of response categories and their relative proportions. The antero-posterior axis of the nucleus exhibits a very weak tonotopicity similar to that found in cortex. As in cortex, units responding to frequency change are often completely direction specific. On the other hand a high proportion of tone responsive units do so with inhibition. An apparently unique feature is the existence of ‘W-units’ which exhibit wide-band inhibitory response curves with a central region of excitation.
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