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PRIMATES from which the cortex of one cerebral hemisphere has been removed circle in walking toward the side of the lesion; such animals also show contralateral hemiparesis together with deviation of head and eyes toward the side of the lesion. With all types of progression there is rotatory movement which appears to be involuntary and purposeless and becomes accentuated under emotional stimuli such as rage, fear, or the sight of food. Deviation of head and eyes, and circling occur in hemidecorticate cats and dogs, as well as in