The hand knows something that the eye does not: Reaching movements resist the Müller–Lyer illusion whether or not the target is foveated

Previous reports suggest that saccades are affected by the Müller–Lyer (ML) pictorial illusion, whereas reaching movements are not. It is unclear if the resistance of reaching to illusions depends on the concurrent engagement of the oculomotor system. Here we show that the endpoints and kinematics o...

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Veröffentlicht in:Neuroscience letters 2007-10, Vol.426 (2), p.111-116
Hauptverfasser: Thompson, Aidan A., Westwood, David A.
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container_title Neuroscience letters
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creator Thompson, Aidan A.
Westwood, David A.
description Previous reports suggest that saccades are affected by the Müller–Lyer (ML) pictorial illusion, whereas reaching movements are not. It is unclear if the resistance of reaching to illusions depends on the concurrent engagement of the oculomotor system. Here we show that the endpoints and kinematics of reaching movements were unaffected by a peripherally viewed ML stimulus regardless of whether or not a concurrent saccade was carried out. Primary saccade endpoints were affected by the ML stimulus but secondary saccades were not. Perceptual judgments of target location were influenced by the ML stimulus in the expected direction. The resistance of reaching movements to pictorial illusions does not appear to depend on the concurrent engagement of the oculomotor system. Implications for models of oculomotor and upper limb control are discussed.
doi_str_mv 10.1016/j.neulet.2007.09.006
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source MEDLINE; Elsevier ScienceDirect Journals
subjects Action
Adult
Biological and medical sciences
Eye and associated structures. Visual pathways and centers. Vision
Female
Fundamental and applied biological sciences. Psychology
Hand
Humans
Illusion
Male
Middle Aged
Movement - physiology
Optical Illusions - physiology
Perception
Photic Stimulation - methods
Psychomotor Performance - physiology
Reaching
Saccade
Saccades - physiology
Space Perception - physiology
Vertebrates: nervous system and sense organs
Vision
title The hand knows something that the eye does not: Reaching movements resist the Müller–Lyer illusion whether or not the target is foveated
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