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The Journal of Neuroscience, December 17, 2008, 28(51):13786-13792; doi:10.1523/JNEUROSCI.1026-08.2008
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Behavioral/Systems/Cognitive
Attention Enhances the Neural Processing of Relevant Features and Suppresses the Processing of Irrelevant Features in Humans: A Functional Magnetic Resonance Imaging Study of the Stroop Task
Thad A. Polk,1,2 * Robert M. Drake,2 * John J. Jonides,1,2 Mason R. Smith,1 andEdward E. Smith3 1Psychology Department and 2Neuroscience Program, University of Michigan, Ann Arbor, Michigan 48109, and 3Psychology Department, Columbia University, New York, New York 10027
Correspondence should be addressed to Dr. Thad A. Polk, Department of Psychology, University of Michigan, 530 Church Street, Ann Arbor, MI 48109. Email: tpolk{at}umich.edu
We present a functional MRI experiment investigating the neural basis of feature-based attention in humans using the Stroop task. Cortical areas specifically involved in color processing and word reading were first identified in individual participants using independent tests. These areas were then probed during the Stroop task (in which participants must selectively attend to the font color of a word while ignoring the word itself). We found that activation in functionally defined color areas increased during the task relative to a neutral color-naming task while activation in functionally defined word areas decreased. These results are consistent with a biased competition model of feature-based attention in which the processing of attended features is enhanced and the processing of ignored features is suppressed.
Key words: attention; Stroop task; feature-based; functional MRI; enhancement; suppression
Received March 7, 2008; revised Aug. 27, 2008; accepted Oct. 17, 2008.
Correspondence should be addressed to Dr. Thad A. Polk, Department of Psychology, University of Michigan, 530 Church Street, Ann Arbor, MI 48109. Email: tpolk{at}umich.edu
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