Image segregation in strabismic amblyopia.

Image segregation in strabismic amblyopia. Research Abstract Details 

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Image segregation in strabismic amblyopia. Abstract Text:

Dennis M Levi,

Humans with naturally occurring amblyopia show deficits thought to involve mechanisms downstream of V1. These include excessive crowding, abnormal global image processing, spatial sampling and symmetry detection and undercounting. Several recent studies suggest that humans with naturally occurring amblyopia show deficits in global image segregation. The current experiments were designed to study figure-ground segregation in amblyopic observers with documented deficits in crowding, symmetry detection, spatial sampling and counting, using similar stimuli. Observers had to discriminate the orientation of a figure (an "E"-like pattern made up of 17 horizontal Gabor patches), embedded in a 7x7 array of Gabor patches. When the 32 "background" patches are vertical, the "E" pops-out, due to segregation by orientation and performance is perfect; however, if the background patches are all, or mostly horizontal, the "E" is camouflaged, and performance is random. Using a method of constant stimuli, we varied the number of "background" patches that were vertical and measured the probability of correct discrimination of the global orientation of the E (up/down/left/right). Surprisingly, amblyopes who showed strong crowding and deficits in symmetry detection and counting, perform normally or very nearly so in this segregation task. I therefore conclude that these deficits are not a consequence of abnormal segregation of figure from background.

Image segregation in strabismic amblyopia. Publishing Authors By Initials

DM Levi,

For similar strabismus research abstracts see: strabismus research

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Image segregation in strabismic amblyopia. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Vision research

VOLUME: 47

Page Numbers: 1833-8

Journal Abbreviation: Vision Res.

ISSN: 0042-6989

DAY: 17

MONTH: 04

YEAR: 2007

Image segregation in strabismic amblyopia. Information

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LANGUAGE: eng

NlmUniqueID: 417402

Image segregation in strabismic amblyopia. Keywords Mesh Terms:

KEYWORDS: Strabismus

MESH TERMS: psychology

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Grant and Affiliation Information for Image segregation in strabismic amblyopia.

AFFILIATION: School of Optometry and Helen Wills Neuroscience Institute, University of California, Berkeley, CA 94720-2020, USA. dlevi@berkeley.edu

Country: England

AGENCY: United States NEI

GRANT: R01EY01728

ACRONYM: EY

MEDLINETA: Vision Res

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