Winners and losers: Reward and punishment produce biases in temporal selection.

Studies of visual search demonstrate that the 'learned value' of stimuli (the extent to which they signal valued events, such as rewards and punishments) influences whether they will be prioritized by spatial attention. Recent work suggests that learned value also modulates attentional prioritization even when all stimuli are presented in the same location, suggesting an influence on temporal selection wherein value-related stimuli become more capable of disrupting central mechanisms of perceptual awareness. However, it remains unclear whether temporal selection is influenced specifically by learning about the relationship of stimuli with reward, or with punishment, or both. This question motivated the current experiments. Participants saw a stream of pictures in a central location, and had to identify the orientation of a rotated target picture. In Experiment 1, response accuracy was reduced if the target was preceded by a 'valued' distractor picture that signaled that a correct response to the target would be rewarded, relative to a distractor picture that did not signal reward. In Experiment 2, accuracy was reduced if the valued distractor picture signaled that an incorrect response would be punished, relative to a distractor that did not signal punishment. Experiment 3 replicated these findings, and demonstrated that the influence of rewards/punishments persisted into an extinction phase in which valued distractors were entirely task-irrelevant. These findings suggest that it is the motivational significance of the outcome, rather than its valence, that is the crucial determinant of the influence of learned value on temporal selection. (PsycINFO Database Record