Abstract
Changes in the discharge rate of single units in the optic tract (OT), lateral geniculate nucleus (LGN) and thalamic reticular nucleus (TRN) during the sleep wakefulness cycle were studied in cats. The OT and LGN neurons were subdivided into 2 groups, type I (transient) and II (sustained) neurons. During periods of cortical EEG-synchronization the tonic response of type I LGN neurons was strongly depressed, while the response of type II LGN neurons showed little change. The maintained, spontaneous discharge rate was depressed in some LGN neurons during synchronization. No effect was seen in OT neurons, and no consistent effect in TRN neurons. These results are discussed in terms of a modulation of (recurrent) inhibition in LGN.
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