Cerebral Cortex, Vol 7, 181-192, Copyright © 1997 by Oxford University Press
SA Engel, GH Glover and BA Wandell
A method of using functional magnetic resonance imaging (fMRI) to measure
retinotopic organization within human cortex is described. The method is
based on a visual stimulus that creates a traveling wave of neural activity
within retinotopically organized visual areas. We measured the fMRI signal
caused by this stimulus in visual cortex and represented the results on
images of the flattened cortical sheet. We used the method to locate visual
areas and to evaluate the spatial precision of fMRI. Specifically, we: (i)
identified the borders between several retinotopically organized visual
areas in the posterior occipital lobe; (ii) measured the function relating
cortical position to visual field eccentricity within area V1; (iii)
localized activity to within 1.1 mm of visual cortex; and (iv) estimated
the spatial resolution of the fMRI signal and found that signal amplitude
falls to 60% at a spatial frequency of 1 cycle per 9 mm of visual cortex.
This spatial resolution is consistent with a linespread whose full width at
half maximum spreads across 3.5 mm of visual cortex.
ARTICLES
Retinotopic organization in human visual cortex and the spatial precision of functional MRI
Department of Psychology, Stanford University, CA 94305, USA.
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