Cerebral Cortex Advance Access originally published online on May 27, 2004
Cerebral Cortex 2004 14(12):1346-1357; doi:10.1093/cercor/bhh095
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© Oxford University Press 2004
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Control of Object-based Attention in Human Cortex
1 Department of Psychological and Brain Sciences, Johns Hopkins University (JHU), Baltimore, MD 21218, USA, 2 Department of Neurocognition, Universiteit Maastricht, The Netherlands, 3 F.C. Donders Centre for Cognitive Neuroimaging, Nijmegen, The Netherlands, 4 F.M. Kirby Research Center for Functional Brain Imaging, Kennedy Krieger Institute, Baltimore, MD 21205, USA, 5 Department of Neuroscience, JHU School of Medicine, Baltimore, MD 21205, USA, 6 Department of Radiology, JHU School of Medicine, Baltimore, MD 21205, USA
Visual attention is a mechanism by which observers select relevant or important information from the current visual array. Previous investigations have focused primarily on the ability to select a region of space for further visual analysis. These studies have revealed a distributed frontoparietal circuit that is responsible for the control of spatial attention. However, vision must ultimately represent objects and in real scenes objects often overlap spatially; thus attention must be capable of selecting objects and their properties nonspatially. Little is known about the neural basis of object-based attentional control. In two experiments, human observers shifted attention between spatially superimposed faces and houses. Event-related functional magnetic resonance imaging (fMRI) revealed attentional modulation of activity in face- and house-selective cortical regions. Posterior parietal and frontal regions were transiently active when attention was shifted between spatially superimposed perceptual objects. The timecourse of activity provides insight into the functional role that these brain regions play in attentional control processes.
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