Abstract

Electrical stimulation of the lateral hypothalamus in cats gave rise to directed attacks on an anesthetized rat. This electrically initiated attack was facilitated by concurrent stimulation of the midbrain reticular formation. By itself, the midbrain stimulation that facilitated attack produced only minimal alerting. At higher intensities, stimulation of the midbrain alone gave rise to tegmental reactions, and to attack and flight. These last two reactions occurred either with or without a marked display. The mesencephalic reticular formation can accelerate and intensify behavioral sequences. It both facilitates and inhibits the appropriate reflexes to bring about a well coordinated behavioral response.

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