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Insensitive when prepared: Evidence for advanced saccade preparation in a gap task| old_uid | 3590 |
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| title | Insensitive when prepared: Evidence for advanced saccade preparation in a gap task |
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| start_date | 2007/12/04 |
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| schedule | 11h-12h |
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| online | no |
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| summary | The gap effect is one of the most robust effects in oculomotor research. It shows that saccade latency is reduced when the fixation stimulus disappears prior to the onset of a peripheral saccade target (gap condition) as compared to when the fixation stimulus remains on (overlap condition). The gap effect results from a disengagement of fixation, but as suggested in several studies, there is another warning-type component that contributes to the effect. I will present data from a series of experiments using novel versions of gap/overlap tasks, showing (1) that the impact of salient visual events on saccade generation is limited in the gap task, (2) that the effect of visual events decreases when target uncertainty is lower, and (3) that a substantial part of saccade preparation is based on target information currently available, rather than only long-term practice effects. These findings show that the gap effect is at least partly due to advanced motor preparation. More generally they demonstrate how visual input is combined with preparatory motor activity for the generation of saccadic eye movements. |
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| responsibles | Pélissier |
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