The retinotopy of visual spatial attention. Tootell, R. B., Hadjikhani, N., Hall, E. K., Marrett, S., Vanduffel, W., Vaughan, J. T., & Dale, A. M. Neuron, 21:1409-22, 1998. abstract bibtex We used high-field (3T) functional magnetic resonance imaging (fMRI) to label cortical activity due to visual spatial attention, relative to flattened cortical maps of the retinotopy and visual areas from the same human subjects. In the main task, the visual stimulus remained constant, but covert visual spatial attention was varied in both location and load. In each of the extrastriate retinotopic areas, we found MR increases at the representations of the attended target. Similar but smaller increases were found in V1. Decreased MR levels were found in the same cortical locations when attention was directed at retinotopically different locations. In and surrounding area MT+, MR increases were lateralized but not otherwise retinotopic. At the representation of eccentricities central to that of the attended targets, prominent MR decreases occurred during spatial attention.
@article{ Tootell_Etal98,
author = {Tootell, R. B. and Hadjikhani, N. and Hall, E. K. and Marrett, S.
and Vanduffel, W. and Vaughan, J. T. and Dale, A. M.},
title = {The retinotopy of visual spatial attention},
journal = {Neuron},
year = {1998},
volume = {21},
pages = {1409-22},
abstract = {We used high-field (3T) functional magnetic resonance imaging (fMRI)
to label cortical activity due to visual spatial attention, relative
to flattened cortical maps of the retinotopy and visual areas from
the same human subjects. In the main task, the visual stimulus remained
constant, but covert visual spatial attention was varied in both
location and load. In each of the extrastriate retinotopic areas,
we found MR increases at the representations of the attended target.
Similar but smaller increases were found in V1. Decreased MR levels
were found in the same cortical locations when attention was directed
at retinotopically different locations. In and surrounding area MT+,
MR increases were lateralized but not otherwise retinotopic. At the
representation of eccentricities central to that of the attended
targets, prominent MR decreases occurred during spatial attention.}
}
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