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Extra-Retinal Vision: Firing at Will

Freeman, Tom C. A. 2007. Extra-Retinal Vision: Firing at Will. Current Biology 17 (3) , R99-R101. 10.1016/j.cub.2007.01.020

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Abstract

Recent evidence suggests that a key visual motion centre in the brain ignores extra-retinal motor information concerning reflexive eye movement. Instead it seems that neurons sensitive to oculomotor actions in this area fire at will. Smooth eye movements create havoc in the images sent to the brain. As we track moving targets, pursuit eye movements destroy the link between real motion and image motion. Targets get glued to the centre of the image while other objects sweep across the retina (Figure 1). How does the visual system drive pursuit onwards and how does it gauge the true velocity of objects? One solution is to use concurrent motor activity as a proxy for target motion. We know ‘extra-retinal’ information like this gets fed back at a number of key stages in the visual system. New work by Ono and Mustari [1] suggests that one of the main visual motion centres is quite discriminating about the type of extra-retinal signal it favours: reflexive eye movements are ignored; only deliberate eye movements will do.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Subjects: B Philosophy. Psychology. Religion > BF Psychology
R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
R Medicine > RE Ophthalmology
Publisher: Elsevier
ISSN: 0960-9822
Last Modified: 03 Dec 2018 16:44
URI: http://orca-mwe.cf.ac.uk/id/eprint/33179

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