Performance of infant rhesus monkeys on discrimination learning, delayed response, and discrimination learning set.

Groups ranging in age from 60 to 360 days were compared. The ability to learn the 1st object discrimination presented to them increased with age to an asymptote at approximately 150 days, while learning set acquisition was below the adult level in all groups, and was practically nonexistent in the youngest groups. Performance on delayed […]

Detection of directed daze in rhesus monkeys (Macaca mulatto)

To examine the ability of monkeys to detect the direction of attention of other individuals, the authors quantitatively investigated the visual scanning pattern of rhesus monkeys (Macaca mulatta) in response to visually presented images of a human frontal face. The present results demonstrated not only that monkeys predominantly gaze at the eyes as compared with […]