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Regions of mid-level human visual cortex sensitive to the global coherence of local image patches.

Abstract：

:The global structural arrangement and spatial layout of the visual environment must be derived from the integration of local signals represented in the lower tiers of the visual system. This interaction between the spatially local and global properties of visual stimulation underlies many of our visual capacities, and how this is achieved in the brain is a central question for visual and cognitive neuroscience. Here, we examine the sensitivity of regions of the posterior human brain to the global coordination of spatially displaced naturalistic image patches. We presented observers with image patches in two circular apertures to the left and right of central fixation, with the patches drawn from either the same (coherent condition) or different (noncoherent condition) extended image. Using fMRI at 7T (n = 5), we find that global coherence affected signal amplitude in regions of dorsal mid-level cortex. Furthermore, we find that extensive regions of mid-level visual cortex contained information in their local activity pattern that could discriminate coherent and noncoherent stimuli. These findings indicate that the global coordination of local naturalistic image information has important consequences for the processing in human mid-level visual cortex.

journal_name

J Cogn Neurosci

journal_title

Journal of cognitive neuroscience

authors

Mannion DJ,Kersten DJ,Olman CA

doi

10.1162/jocn_a_00588

subject

Has Abstract

pub_date

2014-08-01 00:00:00

pages

1764-74

issue

8

eissn

0898-929X

issn

1530-8898

journal_volume

26

pub_type

杂志文章

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