Dissociation of eye movement signals and perception during fixation

Zapata, Laura Pérez; Aznar-Casanova, J. Antonio; Supèr, Hans

doi:10.1167/10.7.549

Cited by 1 publication

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“…Early fixation location was the average gaze position between 90 and 130 ms after saccade onset towards the first target. This time period occurs during target fixation and well before the onset of a corrective saccade (Pérez Zapata et al ., , ). Late fixation location was the average gaze position between 380 and 420 ms after saccade onset, which is after the corrective saccade onset.…”

Section: Methodsmentioning

confidence: 99%

Evidence for a role of corrective eye movements during gaze fixation in saccade planning

Zapata

Puig

Aznar-Casanova

et al. 2014

Eur J of Neuroscience

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In a three-dimensional (3D) world most saccades are made towards visual targets that are located at different distances. We previously demonstrated that gaze shifts within 3D space consist of two stages: a target saccade followed by a corrective saccade during gaze fixation that directs the eyes to the physical target location. We proposed that, by accurately positioning the eyes on the visual object, the visual system maintains an orderly representation of the visual world. In this study we used a double saccade experiment to assess the function of corrective saccades in humans. We found that, when a corrective eye movement occurred during fixation on the first target point, the direction of the second saccade towards the next target point was accurate. When a corrective saccade was absent, a directional error of the second target saccade was observed. This finding, which cannot be explained by current models of eye movement control, supports the idea of a two-step model in saccade programming. We suggest that the motor system sends a corollary discharge when programming a corrective saccade for maintaining an orderly representation of the visual world. In conclusion, our results indicate that corrective saccades have a role in programming target saccades within 3D space.

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Section: Methodsmentioning

confidence: 99%