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Memory-guided saccades show effect of a perceptual illusion whereas visually guided saccades do not

Massendari, Delphine and Lisi, Matteo and Collins, Thérèse and Cavanagh, Patrick (2018) 'Memory-guided saccades show effect of a perceptual illusion whereas visually guided saccades do not.' Journal of Neurophysiology, 119 (1). 62 - 72. ISSN 0022-3077

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The double-drift stimulus (a drifting Gabor with orthogonal internal motion) generates a large discrepancy between its physical and perceived path. Surprisingly, saccades directed to the double-drift stimulus land along the physical, and not perceived, path (Lisi M, Cavanagh P. Curr Biol 25: 2535−2540, 2015). We asked whether memory-guided saccades exhibited the same dissociation from perception. Participants were asked to keep their gaze centered on a fixation dot while the double-drift stimulus moved back and forth on a linear path in the periphery. The offset of the fixation was the go signal to make a saccade to the target. In the visually guided saccade condition, the Gabor kept moving on its trajectory after the go signal but was removed once the saccade began. In the memory conditions, the Gabor disappeared before or at the same time as the go-signal (0- to 1,000-ms delay) and participants made a saccade to its remembered location. The results showed that visually guided saccades again targeted the physical rather than the perceived location. However, memory saccades, even with 0-ms delay, had landing positions shifted toward the perceived location. Our result shows that memory- and visually guided saccades are based on different spatial information.

Item Type: Article
Uncontrolled Keywords: memory-guided saccades, visually guided saccades, double-drift illusion, action-perception dissociation
Divisions: Faculty of Science and Health > Psychology, Department of
Depositing User: Elements
Date Deposited: 07 May 2020 14:00
Last Modified: 07 May 2020 14:00

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