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Title: Regions in the human brain activated by simultaneous orientation discrimination: a study with positron emission tomography
Authors: Dupont, Patrick ×
Vogels, Rufin
Vandenberghe, Rik
Rosier, A
Cornette, L
Bormans, Guy
Mortelmans, Luc
Orban, Guy #
Issue Date: Dec-1998
Publisher: Blackwell science ltd
Series Title: The European Journal of Neuroscience vol:10 issue:12 pages:3689-99
Abstract: In order to compare regional cerebral activity involved in simultaneous as opposed to successive orientation discrimination, we used positron emission tomography to measure regional cerebral blood flow, in two threefold sets of conditions, in a large number of subjects. The first such triad involved simultaneous orientation discrimination, orientation identification and detection, with all tasks using the same pair of gratings. The second triad consisted of successive orientation discrimination with its corresponding identification and detection tasks. Comparisons between tasks within each triad isolate attention to orientation and, respectively, spatial or temporal comparison. The subtraction of detection from simultaneous discrimination revealed activation of right fusiform, right lingual, left precentral, left cingulate and left temporal cortex, in addition to right insula, cerebellum and left thalamus. Only the fusiform, insular and precentral activations remained when the corresponding identification was subtracted from simultaneous discrimination. In contrast, most of the non-visual activation sites remained when simultaneous discrimination was compared with successive discrimination, which also revealed a left lingual activation. These experiments provide further evidence for task-dependent processing in the human visual system and suggest that the right fusiform cortex is involved in spatial as much as temporal comparisons.
URI: 
ISSN: 0953-816X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Research Group Neurophysiology
Research Group Experimental Neurology
Radiopharmacy
Nuclear Medicine & Molecular Imaging
Laboratory for Cognitive Neurology
× corresponding author
# (joint) last author

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