Behavioral Sensitivity to Reward Is Reduced for Far Objects

Abstract

Many studies have demonstrated that people will adjust their behavioral response to a reward on the basis of the time taken to receive the reward. Yet despite growing evidence that time and space are not mentally independent, there has been no examination of whether spatial distance may also affect the way people respond to rewarding objects. We examined speeded binary decisions about objects associated with high, low, or no reward for correct responses. Using a 3-D display, we varied perceived spatial distance so that objects appeared at distances near to or far from participants. Both the speed and the accuracy of responses were better for high-reward objects compared with low- and no-reward objects, but this difference occurred only when the objects appeared at near distance to participants. These results demonstrate that when people respond to rewarding objects, they show sensitivity to spatial-distance information even if the information is irrelevant to the task.

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