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Full-Text Articles in Cognitive 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 …
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 …