Journal
CURRENT BIOLOGY
Volume 17, Issue 11, Pages 989-993Publisher
CELL PRESS
DOI: 10.1016/j.cub.2007.05.005
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Funding
- NCRR NIH HHS [P41 RR008079] Funding Source: Medline
- NEI NIH HHS [R01 EY015261-04, R01 EY015261] Funding Source: Medline
- NINDS NIH HHS [P30 NS057091] Funding Source: Medline
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Lightness is the apparent reflectance of a surface, and it depends not only on the actual luminance of the surface but also on the context in which the surface is viewed [1-10]. The cortical mechanisms of lightness processing are largely unknown, and the role of early cortical areas is still a matter of debate [11-17]. We studied the cortical responses to lightness variations in early stages of the human visual system with functional magnetic resonance imaging (fMRI) while observers were performing a demanding fixation task. The set of dynamically presented visual stimuli included the rectangular version of the classic Cralk O'Brien stimulus (3, 18, 19] and a variant that led to a weaker lightness effect, as well as a pattern with actual luminance variations. We found that the cortical activity in retinotopic areas, including the primary visual cortex (VII), is correlated with co ntext-dependent lightness variations.
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