Recovery of responsiveness of cells of lateral geniculate nucleus of XXXX .

@entity35 @entity308
1. Recovery of responsiveness of single cells in lateral geniculate nucleus of @entity35 has been determined in both P and I cells. There are three types of recovery curve among P cells; (a) early recovery, (b) early partial recovery followed by @entity308 and then complete recovery, (c) prolonged @entity308 followed by cyclic recovery. Type (c) is by far the commonest recovery curve. In contrast to the spike in a P cell, the synaptic potential recovers to its full amplitude in about 20 msec. All I cells exhibit similar rapid recovery curves after a prolonged @entity308 .2. Conditioning stimuli applied to visual cortex also produce a prolonged @entity308 in most P cells but I cells can be re-excited at short intervals from cortex. Decortication does not prevent the prolonged @entity308 of the multineuronal response produced by optic nerve stimulation.3. A neuronal model is proposed to explain these observations. It is supposed that I cells (interneurones) are innervated by axon collaterals of the P cells (principal cells, projecting to visual cortex) and that the I cells exert an inhibitory influence on the P cells.
