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Cerebral Cortex Advance Access originally published online on April 5, 2007
Cerebral Cortex 2008 18(1):38-45; doi:10.1093/cercor/bhm029
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Neural Resources Associated with Perceptual Judgment across Sensory Modalities

Joong Nam Yang1, Nikolaus M. Szeverenyi2 and Daniel Ts'o1

1 Vision Research Laboratories, Department of Neurosurgery, 2 Department of Radiology, State University of New York Upstate Medical University, Syracuse, USA

Address correspondence to Joong Nam Yang, IHP 4116, SUNY Upstate Medical University, 750 East Adams Street, Syracuse, NY 13210, USA. Email: yangjo{at}upstate.edu.

Electrophysiological and brain imaging studies have shown that different populations of neurons contribute to perceptual decision making. Perceptual judgment is a complicated process that has several subprocesses, including the final step of a discrete choice among available possibilities. Using the psychophysical paradigm of difference scaling combined with functional magnetic resonance imaging, we identify an area within a distributed representation that is consistently invoked in perceptual decision. Difference judgments based on visual (color, form, and motion) cues and auditory cues show that a population of neurons in the posterior banks of the intraparietal sulcus (PIPS) is consistently activated for perceptual judgment across visual attributes and sensory modalities, suggesting that those neurons in PIPS are associated with perceptual judgment.

Key Words: audition • decision making • fMRI • perceptual judgment • vision


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