No evidence for peri-saccadic mislocalization on suddenly cancelled saccades J Atsma1, F Maij1, B D Corneil2, P Medendorp1 |
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1Donders Institute, Radboud University Nijmegen, Netherlands |
| Around the time of saccadic eye movements, visual stability is distorted: briefly-flashed stimuli presented up to ~150 ms prior to the saccade are systematically mislocalized. One possibility could be that the origin of this mislocalization is a result of saccade planning. To test this, we combined a countermanding task with a peri-saccadic mislocalization task. Subjects performed 1600 trials each, reporting the perceived location of a briefly-flashed stimulus on trials with or without an imperative stop signal, timing the stop signal so that subjects cancelled ~50% of stop-signal trials. By estimating the time needed for saccade cancellation and using the history of recent reaction times, we were able to examine mislocalization relative to the point of no return. While systematic mislocalization was evident on trials without a stop signal and on non-cancelled trials, we saw no evidence for systematic mislocalization on any cancelled trials, even if they were cancelled very close to the point of no return. These results show that the distortion of visual stability is gated by the saccade. |
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