Ventral extra-striate cortical areas are required for optimal orientation averaging

Allen, Harriet A. and Humphreys, Glyn W. and Bridge, Holly (2007) Ventral extra-striate cortical areas are required for optimal orientation averaging. Vision Research, 47 (6). pp. 766-775. ISSN 1878-5646

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Abstract

We examined the ability of a previously well-studied patient with visual agnosia to compute the average orientation of elements in visual displays. In a structural MRI study, we show that the lesion is likely to involve a variety of ventral extra-striate areas, including V2, V3 and V4; however, the lesion does not extend dorsally. Subsequently we show that some ability to compute average orientation is spared, though there are limitations on the ability to scale the averaging process as a function of the numbers of elements. The results suggest that some aspects of orientation averaging can be accomplished in spared regions of V1 but flexible averaging requires ventral extra-striate cortex.

Item Type: Article
Keywords: Orientation, External Noise, Internal Noise, MRI, Lesion, Texture
Schools/Departments: University of Nottingham UK Campus > Faculty of Science > School of Psychology
Identification Number: https://doi.org/10.1016/j.visres.2006.10.018
Depositing User: Allen, Harriet
Date Deposited: 15 Mar 2016 14:13
Last Modified: 13 Sep 2016 14:40
URI: http://eprints.nottingham.ac.uk/id/eprint/32311

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