Surprise attracts the eyes and binds the gaze

In recent years, researchers have become increasingly interested in the effects that deviations from expectations have on cognitive processing and, in particular, on the deployment of attention. Previous evidence for a surprise–attention link had been based on indirect measures of attention allocation. Here we used eyetracking to directly observe the impact of a novel color on its unannounced first presentation, which we regarded as a surprise condition. The results show that the novel color was quickly responded to with an eye movement, and that gaze was not turned away for a considerable amount of time. These results are direct evidence that deviations from expectations bias attentional priorities and lead to enhanced processing of the deviating stimulus.

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