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J Vis. 2006 Nov 6;6(11):1282-93.

The fate of object features during perisaccadic mislocalization.

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Westfälische Wilhelms-Universität, Münster, Germany.


Visual objects flashed before a saccade appear compressed toward the saccade target. Simultaneously flashed objects merge perceptually into one. To better understand cortical interactions in perisaccadic processing, we study the perception of features of mislocalized objects. We report four new findings: First, when multiple objects of different colors are compressed onto a single position, their color attributes remain distinguishable. Second, color attributes of objects compressed onto the same position compete for access to visual awareness. Third, objects presaccadically mislocalized onto a static background of identical color and luminance appear visible on top of that background. Object shape can be determined. Fourth, objects flashed during a saccade become invisible when a larger object is present at the mislocalized position. Thus, perisaccadic mislocalization affects the position of objects but retains other object features. Mislocalization must either occur in parallel to color and shape processing or at late stages of the visual pathway.

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