title: The psychological organization of "uncertainty" responses and "middle" responses: a dissociation in capuchin monkeys (Cebus apella).
abstract: Some studies of nonhuman animals' metacognitive capacity encourage competing low-level, behavioral descriptions of trial-decline responses by animals in uncertainty-monitoring tasks. To evaluate the force of these behavioral descriptions, the authors presented 6 capuchin monkeys (Cebus apella) with 2 density discrimination tasks between sparse and dense stimuli. In one task, difficult trials with stimuli near the middle of the density continuum could be declined through an "uncertainty" response. In the other task, making a "middle" response to the same stimuli was rewarded. In Experiment 1, capuchins essentially did not use the uncertainty response, but they did use the middle response. In Experiment 2, the authors replicated this result with 5 of 6 monkeys while equating the overall pace and reinforcement structure of the 2 tasks, although 1 monkey also showed appropriate use of the uncertainty response. These results challenge a purely associative interpretation of some uncertainty-monitoring performances by monkeys while sharpening the theoretical question concerning the nature of the psychological signal that occasions uncertainty responses.
authors: Language Research Center, Georgia State University, University Plaza, Atlanta, GA 30303, USA. mjberan@yahoo.com
authors: Michael J
authors: MJ
authors: Beran
authors: J David
authors: JD
authors: Smith
authors: Mariana V C
authors: MV
authors: Coutinho
authors: Justin J
authors: JJ
authors: Couchman
authors: Joseph
authors: J
authors: Boomer
mesh_terms: D000818:Animals; D002428:Cebus / Q000523:psychology*; D003118:Color Perception; D003657:Decision Making; D004193:Discrimination Learning; D005260:Female; D008297:Male; D010364:Pattern Recognition, Visual; D011597:Psychomotor Performance; D011601:Psychophysics; D012055:Reinforcement Schedule; D035501:Uncertainty