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Three rhesus monkeys (Macaca mulatta) performed a simultaneous chaining task in which stimuli had to be sorted according to their visual properties. Each stimulus could vary independently along two dimensions (luminosity and radius), and a cue indicating which dimension to sort by was random trial to trial. These rapid and unpredictable changes constitute a task-switching paradigm, in which subjects...
Rhesus monkeys (Macaca mulatta) engaged in a series of computerized tasks modeled on billiards and arcade games in order to determine their degree of preference for scenarios in which food rewards were contingent on their actions, as opposed to those in which outcomes appeared externally caused. Throughout these tasks, subjects showed a consistent preference for “agentic control,” a state in which...
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