Relation of the Cerebral Cortex to the Grasp Reflex and to Postural and Righting Reflexes

Age and Other Factors in Motor Recovery From Precentral Lesions in Monkeys

“…2) is very pronounced (8). They exhibit changes in intensity of the reflex grasp on changing position, similar to those seen in the older animals after bilateral extirpation of the motor areas (5). Thus with the animal in the lateral position, the undermost extremities are extended, the uppermost are flexed and exhibit reflex grasping.…”

“…During the past five years investigations of the functions of the frontal lobe of subhuman primates have been carried out at the Yale School of Medicine under the direction of Prof. 8. F. Fulton (2,3,4,5). The observations reported in this paper have therefore been made incidentally on a large number of animals operated upon by Doctor Fulton for other purposes, and, in addition, on a smaller number used specifically for this research.…”

“…Motor pareses of one or more extremities were produced in monkeys of various species, in gibbons and in chimpanzees by total and subtotal ablations of the excitable regions of the frontal lobe. In 13 monkeys the motor and premotor regions were completely removed from both hemispheres (5).…”

“…InJluence of interval between ablations from opposite hemispheres. Bieber and Fulton (5) found that when the motor and premotor areas were removed bilaterally from adult monkeys the animals never recovered voluntary power.…”

Brainstem Dysfunction with Supratentorial Mass Lesions

“…with the Central Syndrome, Cheyne-Stokes respiration gradually changed to sustained hyperventilation. The previously small pupils dilated moderately and fixed at midposition (3)(4)(5) mm. ), never dilating widely.…”