J. Cogn. Neurosci.
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(Journal of Cognitive Neuroscience. 2006;18:1518-1530.)
© 2006 The MIT Press

The Involvement of the Inferior Parietal Cortex in the Numerical Stroop Effect and the Distance Effect in a Two-digit Number Comparison Task

Xun Liu1, Hongbin Wang2, Christine R. Corbly1, Jiajie Zhang2 and Jane E. Joseph1

1 University of Kentucky, 2 University of Texas Health Science Center at Houston

Reprint requests should be sent to Xun Liu, Department of Anatomy and Neurobiology, University of Kentucky, Lexington, KY 40536-0098, or via e-mail: xun.liu{at}uky.edu.

The neural mechanism of number representation and processing is currently under extensive investigation. In this functional magnetic resonance imaging study, we designed a number comparison task to examine how people represent and compare two-digit numbers in the brain, and whether they process the decade and unit digits in parallel. We manipulated the decade–unit–digit congruency and numerical distance between the pairs of numbers. We observed both Stroop-like interference and the distance effect in the participants' performance. People responded more slowly to incongruent pairs of numbers and pairs of a smaller distance. The inferior parietal cortex showed common and distinct patterns of activation for both attentional selection and number comparison processes, and its activity was modulated by the Stroop-like interference effect and the distance effect. Taken together, these results support both parallel and holistic comparison of two-digit numbers in the brain.




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