Abstract
Summary
Circling to one or the other side has been observed in 13 animals with lesions in the medulla and pons. Lesions in Deiters' and in the descending vestibular nucleus produced circling toward the side of the lesion, while those in the medial vestibular nucleus, in the medial reticular formation, and in the medial longitudinal fasciculus resulted in circling toward the opposite side. Since the connections between the vestibular mechanism and the motor ocular nuclei and possibly, those between the former and some postural centers were interrupted, these observations are reported as confirmatory of the hypothesis put forward recently by Lurie and Dempsey to explain the circling observed in their experimental guinea pigs.
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