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Brain, Vol. 119, No. 4, 1263-1276, 1996
© 1996 Guarantors of Brain

research-article

The influence of stimulus location on the brain activation pattern in detection and orientation discrimination

A PET study of visual attention

R. Vandenberghe1, P. Dupont2, B. De Bruyn1, G. Bormans2, J. Michicls3, L. Mortelmans2 and G. A. Orban1,

1Laboratorium voor Neuro- en Psychofysiologie, Katholieke Universiteit Leuven Leuven, Belgium 2Department of Nuclear Medicine, University Hospital Gasthuisberg Leuven, Belgium 3Department of Radiology, University Hospital Gasthuisberg Leuven, Belgium

Correspondence to: Correspondence to: Professor Dr G. A. Orban, Laboratorium voor Neuro- en Psychofysiologie, KU Leuven Medical School, Campus Gasthuisberg, Herestraat 49, B-3000 Leuven, Belgium

This PET study concerns changes in regional cerebral blood flow (rCBF) associated with orientation discrimination tasks and with simple detection of the stimulus. The difference in rCBF between discrimination and detection represents the discrimination, or ‘task’, component of the response. We have examined how such differences are influenced by the position of the visual stimulus and also how they change when a peripheral distractor is added to a relevant central stimulus. We first determined the regions in which the task produced the main effect regardless of stimulus position or distraction with an additional stimulus. In these selected regions, we determined the interactions between task and stimulus position and the interactions between task and stimulus addition. Five regions were more active during orientation discrimination than during stimulus detection: the inferior occipital cortex, the right putamen, the superior parietal lobule, the anterior cingulate cortex and the left lower and the right upper premotor area. Stimulus addition interacted with task only in the lower premotor area. Interactions between the task and stimulus position occurred in the occipital and parietal cortex and in the putamen. When a central stimulus was presented instead of a peripheral one the difference between orientation discrimination and stimulus detection was significantly larger in the inferior occipital lobe and in the right putamen. Conversely, the difference between orientation discrimination and stimulus detection in the superior parietal lobule was significantly larger when a peripheral stimulus was presented instead of a central one.

superior parietal lobe; inferior occipital lobe; orientation discrimination; visual attention; PET scan

Received November 3, 1995. Revised February 19, 1996. Accepted April 1, 1996.


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