| Abstract: | Electrographic manifestations (the electrocorticogram — ECoG) of the stages of sleep and waking in the neuronally isolated cortex were studied in freely moving cats. The intensity of the electrographic manifestations of sleep-waking in the isolated cortex depends on the time elapsing after isolation: Whereas they are indistinct in the first weeks, after 4–6 months all stages of sleep and waking found in the normal animal can be recorded in the isolated cortex. The electrographic manifestations during various stages of sleep and waking in the isolated cortex are observed simultaneously with the appearance of the ECoG features of sleep in the opposite, control hemisphere. Of all the stages of sleep and waking, the most variable activity in the isolated cortex is observed in the theta and delta bands, the ways by which  sleep activity arises in the isolated cortex are discussed.Scientific-Research Institute of Experimental Medicine, Academy of Sciences of the USSR, Leningrad. Translated from Neirofiziologiya, Vol. 8, No. 6, pp. 559–567, November–December, 1976. |
