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  Dependence of chromatic responses in V1 on visual field eccentricity and spatial frequency: An fMRI study.

D'Souza, D. V., Auer, T., Frahm, J., Strasburger, H., & Lee, B. B. (2016). Dependence of chromatic responses in V1 on visual field eccentricity and spatial frequency: An fMRI study. Journal of the Optical Society of America A, 33(3), A53-A64. doi:10.1364/JOSAA.33.000A53.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-175D-7 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-81F1-B
Genre: Journal Article

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2261303.pdf (Publisher version), 5MB
 
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D'Souza, D. V., Author
Auer, T.1, Author              
Frahm, J.1, Author              
Strasburger, H., Author
Lee, B. B.2, Author              
Affiliations:
1Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society, ou_578634              
2Emeritus Group of Membrane Biophysics, MPI for Biophysical Chemistry, Max Planck Society, ou_1571137              

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 Abstract: Psychophysical sensitivity to red-green chromatic modulation decreases with visual eccentricity, compared to sensitivity to luminance modulation, even after appropriate stimulus scaling. This is likely to occur at a central, rather than a retinal, site. Blood-oxygenation-level-dependent (BOLD) functional magnetic resonance imaging (fMRI) responses to stimuli designed to separately stimulate different afferent channels' [red-green, luminance, and short-wavelength (S)-cone] circular gratings were recorded as a function of visual eccentricity (+/- 10 deg) and spatial frequency (SF) in human primary visual cortex (V1) and further visual areas (V2v, V3v). In V1, the SF tuning of BOLD fMRI responses became coarser with eccentricity. For red-green and luminance gratings, similar SF tuning curves were found at all eccentricities. The pattern for S-cone modulation differed, with SF tuning changing more slowly with eccentricity than for the other two modalities. This may be due to the different retinal distribution with eccentricity of this receptor type. A similar pattern held in V2v and V3v. This would suggest that transformation or spatial filtering of the chromatic (red-green) signal occurs beyond these areas

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Language(s): eng - English
 Dates: 2016-01-122016-03-01
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1364/JOSAA.33.000A53
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Title: Journal of the Optical Society of America A
Source Genre: Journal
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Pages: - Volume / Issue: 33 (3) Sequence Number: - Start / End Page: A53 - A64 Identifier: -