Npgrj_nn_2123 693..702
نویسندگان
چکیده
Simple perceptual tasks have laid the groundwork for understanding the neurobiology of decision-making. Here, we examined this foundation to explain how decision-making circuitry adjusts in the face of a more difficult task. We measured behavioral and physiological responses of monkeys on a twoand four-choice direction-discrimination decision task. For both tasks, firing rates in the lateral intraparietal area appeared to reflect the accumulation of evidence for or against each choice. Evidence accumulation began at a lower firing rate for the four-choice task, but reached a common level by the end of the decision process. The larger excursion suggests that the subjects required more evidence before making a choice. Furthermore, on both tasks, we observed a time-dependent rise in firing rates that may impose a deadline for deciding. These physiological observations constitute an effective strategy for handling increased task difficulty. The differences appear to explain subjects’ accuracy and reaction times.
منابع مشابه
Sports Med 2005; 35 (8): 685-715
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Yannick Morel EPFL, Ecole Polytechnique Fédérale de Lausanne Lausanne, CH-1015 PHONE : (+41) 21 693 6714 FAX: (+41) 21 693 3705 [email protected] Mathieu Porez IRCCyN Laboratory Ecole des Mines de Nantes 44307 Nantes, France PHONE : (+33) 2 5185 8575 FAX: (+33) 2 4037 6930 [email protected] Auke J. Ijspeert EPFL, Ecole Polytechnique Fédérale de Lausanne Lausanne, CH-1015 PHONE :...
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