Showing papers on "Primate published in 1971"

Recovery of Function after Serial Ablation of Prefrontal Cortex in the Rhesus Monkey

Abstract: Rhesus monkeys with one-stage or serial ablation of sulcus principalis (prefrontal association cortex) were compared on three spatial tasks. On all tests, the serial monkeys made fewer errors than did the monkeys with onestage lesions. These results indicate that partial recovery of function can occur after extensive destruction of association cortex in the mature primate brain if the damage is distributed over a number of operations.

Sleep in the nocturnal primate, Aotus trivirgatus.

Abstract: Measurement of the cycles of wakefulness and stages of sleep in owl monkeys during 24-hr periods divided into half dark and half light segments. Recordings of electrophysiological activity were used. Reversal of the sequence of light and dark served to test the influence of environmental lighting on the sleep-wakefulness cycles. The sleep patterns of owl monkeys expressed in percentage of rapid eye movement (REM) and nonrapid eye movement (NREM) were compared with those of a closely related New World monkey species, Saimiri Sciureus.

Amino acid patterns in the plasma of old and new world primates

Abstract: 1. 1. Fasting plasma amino acid levels were determined in one New World (squirrel monkey) and four Old World (rhesus and talapoin monkeys, chimpanzees, and stump-tailed macaques) subhuman primate species. The values were compared with those for normal human subjects. 2. 2. Few qualitative differences were observed between man and the simian species and among the latter species in the 29 plasma constituents measured. 3. 3. Numerous quantitative differences between man and the simian species and among the latter species were observed.