Abstract
On each trial of a discrete, two-choice reaction time (RT) paradigm, subjects identified one of two equiprobable stimuli by pulling a left-hand or right-hand trigger. For the incentive conditions, the number of points displayed on an event-counter increased after a subject's choice reaction if one of the stimuli (i.e., the critical stimulus) had occurred. Choice RT was significantly shorter to the critical stimulus than to the alternative, “neutral” stimulus when subjects were promised bonus research credit if the critical stimulus reached a minimum frequency of occurrence. Choice RT was assumed to be an index of stimulus expectancy, and therefore the observed effects of stimulus value on RT implied an interaction between expectancy and utility.
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