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  Nonlinear population receptive field changes in human area V5/MT + of healthy subjects with simulated visual field scotomas

Papanikolaou, A., Keliris, G., Lee, S., Logothetis, N., & Smirnakis, S. (2015). Nonlinear population receptive field changes in human area V5/MT + of healthy subjects with simulated visual field scotomas. NeuroImage, 120, 176-190. doi:10.1016/j.neuroimage.2015.06.085.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-4414-D Version Permalink: http://hdl.handle.net/21.11116/0000-0000-B5FC-8
Genre: Journal Article

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Papanikolaou, A1, Author              
Keliris, GA1, Author              
Lee, S1, Author              
Logothetis, NK1, Author              
Smirnakis, SM1, Author              
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1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              

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 Abstract: There is extensive controversy over whether the adult visual cortex is able to reorganize following visual field loss (scotoma) as a result of retinal or cortical lesions. Functional magnetic resonance imaging (fMRI) methods provide a useful tool to study the aggregate receptive field properties and assess the capacity of the human visual cortex to reorganize following injury. However, these methods are prone to biases near the boundaries of the scotoma. Retinotopic changes resembling reorganization have been observed in the early visual cortex of normal subjects when the visual stimulus is masked to simulate retinal or cortical scotomas. It is not known how the receptive fields of higher visual areas, like hV5/MT +, are affected by partial stimulus deprivation. We measured population receptive field (pRF) responses in human area V5/MT + of 5 healthy participants under full stimulation and compared them with responses obtained from the same area while masking the left superior quadrant of the visual field (“artificial scotoma” or AS). We found that pRF estimations in area hV5/MT + are nonlinearly affected by the AS. Specifically, pRF centers shift towards the AS, while the pRF amplitude increases and the pRF size decreases near the AS border. The observed pRF changes do not reflect reorganization but reveal important properties of normal visual processing under different test-stimulus conditions.

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 Dates: 2015-10
 Publication Status: Published in print
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 Identifiers: DOI: 10.1016/j.neuroimage.2015.06.085
BibTex Citekey: PapanikolaouKLLS2015
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Title: NeuroImage
Source Genre: Journal
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Pages: - Volume / Issue: 120 Sequence Number: - Start / End Page: 176 - 190 Identifier: -