Retinotopic organization in human visual cortex and the spatial precision of functional MRI

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ID: 291684
1997
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Ranked #100 of 107 articles by views in cerebral cortex (new york, ny : 1991)

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Abstract
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.
Reference Key
openalex_W2141964005 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Stephen A. Engel, Gary H. Glover, Brian A. Wandell
Journal cerebral cortex (new york, ny : 1991)
Year 1997
DOI
10.1093/cercor/7.2.181
URL
https://academic.oup.com/cercor/article-pdf/7/2/181/9752568/070181.pdf
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