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

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

Authors

Harriet A. Allen H.A.Allen@nottingham.ac.uk

Glyn W. Humphreys g.w.humphreys@bham.ac.uk

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.

Journal Article Type Article
Publication Date Mar 1, 2007
Journal Vision Research
Print ISSN 0042-6989
Electronic ISSN 1878-5646
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 47
Issue 6
Institution 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), doi:10.1016/j.visres.2006.10.018
DOI https://doi.org/10.1016/j.visres.2006.10.018
Keywords Orientation, External Noise, Internal Noise, MRI, Lesion, Texture
Publisher URL http://www.sciencedirect.com/science/article/pii/S0042698906004913#MMCvFirst
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0




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