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Cerebral Cortex Advance Access published online on June 7, 2007
Cerebral Cortex, doi:10.1093/cercor/bhm058
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

When Brightness Counts: The Neuronal Correlate of Numerical–Luminance Interference

Roi Cohen Kadosh1,2, Kathrin Cohen Kadosh1,3 and Avishai Henik1

1 Department of Psychology and Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer-Sheva, Israel, 2 Institute of Cognitive Neuroscience, University College London, London, UK, 3 Centre For Brain and Cognitive Development, School of Psychology, Birkbeck College, University of London, London, UK

Address correspondence to Roi Cohen Kadosh, University College London, London WC1N 3AR, UK. Email: r.cohenkadosh{at}ucl.ac.uk

Previous studies showed that the processing of numerical information and spatial information such as physical size causes a mutual interference. The neuronal correlate of such interference was suggested to be in the parietal lobe. However, a previous study showed that such interference does not occur between numerical information and nonspatial dimensions such as luminance level (Pinel P, Piazza M, Le Bihan D, Dehaene S. 2004. Distributed and overlapping cerebral representations of number, size, and luminance during comparative judgments. Neuron. 41:983–993). Here it is shown that numerical value and luminance level do cause a behavioral interference and that this interference modulates the activity in the parietal lobe. The current results support the idea that the parietal lobe might be equipped with neuronal substrates for magnitude processing even for nonspatial dimensions.

Key Words: conflict task • functional magnetic resonance imaging • intraparietal sulcus • magnitude • numerical cognition • size congruity


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