THE EFFECTS OF LESIONS IN THE CINGULAR GYRUS AND ADJACENT AREAS IN MONKEYS

The attention of physiologists was directed anew to the anterior part of the cingular gyrus by the reports of Smith (1944, 1945) that this area was concerned in autonomic responses, and the findings of McCulloch (1944), using local strychninization, that the area had a widespread cortical suppressor effect. Clinical interest was also aroused by the marked behaviour changes noted by Smith (1944) and Ward (1948a) in monkeys following ablation of this region. The animals became unusually tame and appeared to lose their pre-operative fear of man. behaviour towards their cage-mates also Ward treating inanimate the area we removed the anterior part of the cingular gyri from a number of patients; our results will be reported later, since they can only be assessed by long-term observation.

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