Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 4 of 4
Full-Text Articles in Biological Psychology
Witnessing Reconciliation Reduces Arousal Of Bystanders In A Baboon Group (Papio Hamadryas Hamadryas), Peter G. Judge, Katherine A. Bachmann
Witnessing Reconciliation Reduces Arousal Of Bystanders In A Baboon Group (Papio Hamadryas Hamadryas), Peter G. Judge, Katherine A. Bachmann
Faculty Journal Articles
Reconciliation is the occurrence of friendly behaviour between opponents shortly after an aggressive conflict. In primate groups, reconciliation reduces aggression and post-conflict arousal. Aggression within a group can also increase arousal of bystanders (e.g. increase bystanders’ rates of self-directed behaviour). Since reconciliation reduces aggression between opponents, we tested whether it also reduces self-directed behaviour in bystanders. Following aggression in a captive group of hamadryas baboons, one observer conducted a focal sample on one of the combatants to document reconciliation and a second observer simultaneously conducted a focal sample on a randomly selected bystander. Matched control observations were then collected on …
The Interface Between Morphology And Action Planning: A Comparison Of Two Species Of New World Monkeys, Stacey L. Zander, Dan J. Weiss, Peter G. Judge
The Interface Between Morphology And Action Planning: A Comparison Of Two Species Of New World Monkeys, Stacey L. Zander, Dan J. Weiss, Peter G. Judge
Faculty Journal Articles
Recent research with several species of nonhuman primates suggests sophisticated motor-planning abilities observed in human adults may be ubiquitous among primates. However, there is considerable variability in the extent to which these abilities are expressed across primate species. In the present experiment, we explore whether the variability in the expression of anticipatory motor-planning abilities may be attributed to cognitive differences (such as tool use abilities) or whether they may be due to the consequences of morphological differences (such as being able to deploy a precision grasp). We compared two species of New World monkeys that differ in their tool use …
Capuchin Monkeys Exercise Self-Control By Choosing Token Exchange Over An Immediate Reward, Peter G. Judge, Jennifer L. Essler
Capuchin Monkeys Exercise Self-Control By Choosing Token Exchange Over An Immediate Reward, Peter G. Judge, Jennifer L. Essler
Faculty Journal Articles
Self-control is a prerequisite for complex cognitive processes such as cooperation and planning. As such, comparative studies of self-control may help elucidate the evolutionary origin of these capacities. A variety of methods have been developed to test for self-control in non-human primates that include some variation of foregoing an immediate reward in order to gain a more favorable reward. We used a token exchange paradigm to test for self-control in capuchin monkeys (Cebus apella). Animals were trained that particular tokens could be exchanged for food items worth different values. To test for self-control, a monkey was provided with …
Picture Recognition Of Food By Macaques (Macaca Silenus), Peter G. Judge
Picture Recognition Of Food By Macaques (Macaca Silenus), Peter G. Judge
Faculty Journal Articles
Pictorial representations of three-dimensional objects are often used to investigate animal cognitive abilities; however, investigators rarely evaluate whether the animals conceptualize the two-dimensional image as the object it is intended to represent. We tested for picture recognition in lion-tailed macaques by presenting five monkeys with digitized images of familiar foods on a touch screen. Monkeys viewed images of two different foods and learned that they would receive a piece of the one they touched first. After demonstrating that they would reliably select images of their preferred foods on one set of foods, animals were transferred to images of a second …