A cortical pooling model of spatial summation for perimetric stimuli.

A cortical pooling model of spatial summation for perimetric stimuli. Research Abstract Details 

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A cortical pooling model of spatial summation for perimetric stimuli. Abstract Text:

Fei Pan,William H Swanson,

Contemporary models of perimetric sensitivity assume probability summation of retinal ganglion cell sensitivities, ignoring cortical processing. To assess the role of cortical processing in perimetric spatial summation, we used a common form of multiple-mechanism spatial vision model in which the stimulus is sampled by receptive fields analogous to those of simple cells in primary visual cortex. Psychophysical threshold was computed by probability summation across the receptive fields. When the receptive fields were nonoriented (like ganglion cells), the spatial summation function had a large nonmonotonic transitional region that was inconsistent with perimetric spatial summation data. When the receptive fields were orientation tuned (like cortical cells), the model was able to give good fits to perimetric spatial summation data. The predictions of the model were evaluated with a masking study, in which noise masks either enlarged the critical area or changed the shape of the spatial summation functions. We conclude that cortical pooling by multiple spatial mechanisms can account for perimetric spatial summation, whereas probability summation across ganglion cells cannot.

A cortical pooling model of spatial summation for perimetric stimuli. Publishing Authors By Initials

F Pan,WH Swanson,

For similar psychological phenomena and processes: mental processes: perception: visual perception research abstracts see: psychological phenomena and processes: mental processes: perception: visual perception research

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A cortical pooling model of spatial summation for perimetric stimuli. Journal Published:

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

Journal: Journal of vision

VOLUME: 6

Page Numbers: 1159-71

Journal Abbreviation:

ISSN: 1534-7362

DAY: 13

MONTH: 10

YEAR: 2006

A cortical pooling model of spatial summation for perimetric stimuli. Information

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LANGUAGE: eng

NlmUniqueID: 101147197

A cortical pooling model of spatial summation for perimetric stimuli. Keywords Mesh Terms:

KEYWORDS: Visual Perception

MESH TERMS: physiology

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Grant and Affiliation Information for A cortical pooling model of spatial summation for perimetric stimuli.

AFFILIATION: Glaucoma Institute, State University of New York, State College of Optometry, New York, NY, USA. fpan_mail@yahoo.com

Country: United States

AGENCY: United States NEI

GRANT: EY007716

ACRONYM: EY

MEDLINETA: J Vis

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