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The vascular behavior of various areas in the cortex-and thalamus during arousal reaction of EEG was studied in locally anesthetized and with Flaxedil immobilized cats. For inducing the arousal reaction, iterative rectangular pulses were applied to the mesencephalic reticular formation, and for measuring local blood flow in the brain, the heated thermistor method described previously was utilized. In the cat with the intact central nervous system, the arousal reaction accompanied always a temporal rise in the systemic blood pressure. In parallel with this pressor response, increases in blood flow occurred, both in cortical and thalamic areas. In the encephale isole cat, EEG arousal appeared without any observable change of blood pressure. Despite the lack of the pressor response in this preparation, EEG arousal induced a definite flow increase in the thalamic areas lasting for over 30 see, whereas the local blood flow in the cerebral cortex remained unchanged during the reaction as far as it was measured by the heated thermistor method. When i.v. injection of Nembutal was made, both EEG and thalamic flow response to MRF stimulation diminished concurrently. Stimulation to VA and CM also evoked similar flow responses.

Cerebral Circulation during Arousal Reaction of EEG