Ventral extra-striate cortical areas are required for optimal orientation averaging
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...
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| Format: | Article |
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Elsevier
2007
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| Online Access: | https://eprints.nottingham.ac.uk/32311/ |
| _version_ | 1848794381157400576 |
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| author | Allen, Harriet A. Humphreys, Glyn W. Bridge, Holly |
| author_facet | Allen, Harriet A. Humphreys, Glyn W. Bridge, Holly |
| author_sort | Allen, Harriet A. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T19:15:17Z |
| format | Article |
| id | nottingham-32311 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:15:17Z |
| publishDate | 2007 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-323112020-05-04T16:26:46Z https://eprints.nottingham.ac.uk/32311/ Ventral extra-striate cortical areas are required for optimal orientation averaging Allen, Harriet A. Humphreys, Glyn W. Bridge, Holly 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. Elsevier 2007-03-01 Article PeerReviewed Allen, Harriet A., 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 Orientation External Noise Internal Noise MRI Lesion Texture http://www.sciencedirect.com/science/article/pii/S0042698906004913#MMCvFirst doi:10.1016/j.visres.2006.10.018 doi:10.1016/j.visres.2006.10.018 |
| spellingShingle | Orientation External Noise Internal Noise MRI Lesion Texture Allen, Harriet A. Humphreys, Glyn W. Bridge, Holly Ventral extra-striate cortical areas are required for optimal orientation averaging |
| title | Ventral extra-striate cortical areas are required for optimal orientation averaging |
| title_full | Ventral extra-striate cortical areas are required for optimal orientation averaging |
| title_fullStr | Ventral extra-striate cortical areas are required for optimal orientation averaging |
| title_full_unstemmed | Ventral extra-striate cortical areas are required for optimal orientation averaging |
| title_short | Ventral extra-striate cortical areas are required for optimal orientation averaging |
| title_sort | ventral extra-striate cortical areas are required for optimal orientation averaging |
| topic | Orientation External Noise Internal Noise MRI Lesion Texture |
| url | https://eprints.nottingham.ac.uk/32311/ https://eprints.nottingham.ac.uk/32311/ https://eprints.nottingham.ac.uk/32311/ |