Eye position-dependent activity in the primary visual area as revealed by fMRI
Hum. Brain Mapp.. 2007-01-01; 28(7): 673-680
DOI: 10.1002/hbm.20296
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1. Hum Brain Mapp. 2007 Jul;28(7):673-80.
Eye position-dependent activity in the primary visual area as revealed by fMRI.
Andersson F(1), Joliot M, Perchey G, Petit L.
Author information:
(1)Groupe d’Imagerie Neurofonctionnelle (GIN), UMR6194, CNRS, CEA, Université
Paris 5, GIP CYCERON, Caen, France.
Internal senses of the position of the eye in the orbit may influence the
cognitive processes that take into account gaze and limb positioning for movement
or guiding actions. Neuroimaging studies have revealed eye position-dependent
activity in the extrastriate visual, parietal, and frontal areas, but, at the
earliest vision stage, the role of the primary visual area (V1) in these
processes remains unclear. Functional MRI (fMRI) was used to investigate the
effect of eye position on V1 activity evoked by a quarter-field stimulation using
a visual checkerboard. We showed that the amplitude of V1 activity was modulated
by the position of the eye, the activity being maximal when both the eye and head
positions were aligned. Previous studies gave impetus to the emerging view that
V1 activity is a cortical area in which contextual influences take place. The
present study suggests that eye position may affect an early stage of visual
processing.
Copyright 2007 Wiley-Liss, Inc.
DOI: 10.1002/hbm.20296
PMID: 17089375 [Indexed for MEDLINE]