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The importance of stimulus qualities such as orientation, motion and luminance in blindsight are well known but their cortical basis has been much less explored. We therefore studied the performance of two blindsighted hemianopic subjects (GY and MS), in a task in which the subject had to decide in which of two adjunctive intervals a pattern of global spots moved coherently, at a variety of speeds, in the hemianopic field. Their ability was compared with that of two control subjects with normal vision. Both hemianopes performed this simple discrimination well in their blind fields but their performance was impaired by repetitive transcranial magnetic stimulation (rTMS) applied over cortical area hV5/MT(+) although not, or only slightly, by stimulation over the region of V3 or the vertex. The result is a direct demonstration that area hV5/MT(+) is necessary for global motion detection in blindsight.

Original publication

DOI

10.1007/s00221-008-1508-4

Type

Journal article

Journal

Exp Brain Res

Publication Date

01/2009

Volume

192

Pages

407 - 411

Keywords

Adaptation, Physiological, Aged, Blindness, Cortical, Hemianopsia, Humans, Male, Middle Aged, Motion Perception, Neuronal Plasticity, Neuropsychological Tests, Photic Stimulation, Recovery of Function, Temporal Lobe, Transcranial Magnetic Stimulation, Visual Cortex, Visual Fields, Visual Pathways