Title: Color discrimination involves ventral and dorsal stream visual areas
Authors: Claeys, Kristl ×
Dupont, Patrick
Cornette, Luc
Sunaert, Stefan
Van Hecke, Paul
De Schutter, Erik
Orban, Guy #
Issue Date: Jul-2004
Series Title: Cerebral cortex (New York, N.Y. : 1991) vol:14 issue:7 pages:803-22
Abstract: We used positron emission tomography (PET) and functional magnetic resonance imaging (fMRI) in human subjects to investigate whether the ventral and dorsal visual stream cooperate when active judgements about color have to be made. Color was used as the attribute, because it is processed primarily in the ventral stream. The centrally positioned stimuli were equiluminant shades of brown. The successive color discrimination task was contrasted to a dimming detection task, in which retinal input was identical but with double the number of motor responses. The stimulus presentation rate was parametrically varied and a constant performance level was obtained for all conditions. The visual activation sites were identified by retinotopic mapping and cortical flattening. In addition, one psychophysical and two fMRI experiments were performed to control for differences in visuospatial attention and motor output. Successive color discrimination involved early visual areas, including V1 and VP and the ventral color-responsive region, as well as anterior and middle dorsal intraparietal sulcus, dorsal premotor cortex and pre-SMA. Cortical regions involved in dimming detection and motor output included area V3A, hMT/V5+, lateral occipital sulcus, posterior dorsal intraparietal sulcus, primary motor cortex and SMA. These experiments demonstrated that even with color as the attribute, successive discrimination, in which a decision process has to link visual signals to motor responses, involves both ventral and dorsal visual stream areas.
ISSN: 1047-3211
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Faculty of Medicine - miscellaneous
Nuclear Medicine & Molecular Imaging
Research Group Neurophysiology
Research Group Experimental Neurology
Laboratory for Cognitive Neurology
Translational MRI (+)
× corresponding author
# (joint) last author

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