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J Neurophysiol (July 8, 2009). doi:10.1152/jn.00102.2009
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Submitted on February 4, 2009
Revised on July 1, 2009
Accepted on July 4, 2009

Visual field maps, population receptive field sizes, and visual field coverage in the human MT+ complex

Kaoru Amano1*, Brian A Wandell2, and Serge O Dumoulin3

1 The university of Tokyo
2 Stanford University
3 Helmholtz Institute

* To whom correspondence should be addressed. E-mail: amano{at}brian.k.u-tokyo.ac.jp.

Human neuroimaging experiments typically localize motion-selective cortex (MT+) by contrasting responses to stationary and moving stimuli. It has long been suspected that MT+, located on the lateral surface at the temporal-occipital (TO) boundary, contains several distinct visual field maps; but only one coarse map has been measured. Using a novel fMRI model-based method we identified two maps, TO-1 and TO2, and measured population receptive field (pRF) sizes within these maps. The angular representation of the first map, TO-1, has a lower vertical meridian on its posterior side at the boundary with LO-2. The angular representation continues through horizontal to the upper vertical meridian at the boundary with the second map, TO-2. The TO-2 angle map reverses from upper to lower visual field at increasingly anterior positions. The TO maps share a parallel eccentricity map in which center-to-periphery is represented in the ventral-to-dorsal direction; both maps have an expanded foveal representation. There is a progressive increase in the pRF size from V1/2/3 to LO-1/2 and TO-1/2, with the largest pRF sizes in TO-2. Further, within each map the pRF size increases as a function of eccentricity. The visual field coverage of both maps extends into the ipsilateral visual field, with larger sensitivity to peripheral ipsilateral stimuli in TO-2 than in TO-1. The TO maps provide a functional segmentation of human motion-sensitive cortex that enables a more complete characterization of processing in human motion-selective cortex.







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