Restricted (laboratory-reared) and feral monkeys were compared on several tests involving an albino rat and on reactions to an unfamiliar room. Although they made fewer contacts with their rats, restricted monkeys were relatively less gentle with their rats in the living cages and chose them less often when they were available as a social incentive. The restricted monkeys crouched, rocked, sucked thumbs, etc., when introduced alone into an unfamiliar room. It is suggested that these "self-directed responses [are] derived from infantile responses ordinarily made with reference to the mother." (PsycINFO Database Record (c) 2006 APA, all rights reserved)