Abstract
Oxygen cathodes were implanted chronically in the lateral and basal amygdaloid nuclei and the nucleus reticularis pontis caudalis to record local oxygen availability in the brains of cats. The animals were controlled behaviorally and electrophysiologically to determine their actual state. In every experimental session the oxygen-dependence of the cathodes was tested. During slow-wave sleep, phasic pO 2 shifts were observed only at the lateral amygdaloid nucleus, characterized by a striking increase in the amplitude of oscillations. The basal amygdaloid nucleus together with the nucleus reticularis pontis caudalis showed pO 2 oscillating responses only in the REM or paradoxical sleep phase. It is postulated that those variations are due to a local increase of neuronal activity. Hence, the lateral amygdaloid nucleus assumes the role of a subcortical structure closely related to slow sleep and the basal amygdaloid nucleus, found to be activated along with the nucleus reticularis pontis caudalis, is assumed to be related to REM or paradoxical sleep. Changes during quiet and active wakefulness are also described.
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