Electroencephalographic changes occur after small unilateral lesions have been made in the pontine tegmentum of cats with permanently implanted electrodes. Lesions in the area of the nucleus reticularis pontis oralis produce electroencephalographic synchronization (sleep pattern). Lesions in the pontine and caudal midbrain tegmentum, dorsal, lateral, and caudal to the lesions producing synchronization, produced electroencephalographic activation (waking pattern).
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Camacho-Evangelista et al. (1964) studied this question.