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

Allen, Harriet A.; Humphreys, Glyn W.; Bridge, Holly

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Authors

HARRIET ALLEN H.A.Allen@nottingham.ac.uk
Professor of Lifespan Psychology

Glyn W. Humphreys

Holly Bridge



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.

Citation

Allen, H. A., Humphreys, G. W., & Bridge, H. (2007). Ventral extra-striate cortical areas are required for optimal orientation averaging. Vision Research, 47(6), https://doi.org/10.1016/j.visres.2006.10.018

Journal Article Type Article
Publication Date Mar 1, 2007
Deposit Date Mar 15, 2016
Publicly Available Date Mar 29, 2024
Journal Vision Research
Print ISSN 0042-6989
Electronic ISSN 1878-5646
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 47
Issue 6
DOI https://doi.org/10.1016/j.visres.2006.10.018
Keywords Orientation, External Noise, Internal Noise, MRI, Lesion, Texture
Public URL https://nottingham-repository.worktribe.com/output/703965
Publisher URL http://www.sciencedirect.com/science/article/pii/S0042698906004913#MMCvFirst

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