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J Neurophysiol 88: 2088-2095, 2002;
0022-3077/02 $5.00
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The Journal of Neurophysiology Vol. 88 No. 4 October 2002, pp. 2088-2095
Copyright ©2002 by the American Physiological Society

Localizing Visual Discrimination Processes in Time and Space

Jens-Max Hopf,1 Edward Vogel,2 Geoffrey Woodman,3 Hans-Jochen Heinze,1 and Steven J. Luck3

 1Department of Neurology II, Otto-von-Guericke University, D-39120 Magdeburg, Germany;  2Department of Psychology, University of Oregon, Eugene, Oregon 97403-1227; and  3Department of Psychology, University of Iowa, Iowa City, Iowa 52242-1407

Hopf, Jens-Max, Edward Vogel, Geoffrey Woodman, Hans-Jochen Heinze, and Steven J. Luck. Localizing Visual Discrimination Processes in Time and Space. J. Neurophysiol. 88: 2088-2095, 2002. Previous studies of visual processing in humans using event-related potentials (ERPs) have demonstrated that task-related modulations of an early component called the "N1" wave (140-200 ms) reflect the operation of a voluntary discrimination process. Specifically, this component is larger in tasks requiring target discrimination than in tasks requiring simple detection. The present study was designed to localize this discriminative process in both time and space by means of combined magnetoencephalographic (MEG) and ERP recordings. Discriminative processing led to differential ERP and MEG activity beginning within 150 ms of stimulus onset. Source localization of the combined ERP/MEG data was performed using anatomical constraints from structural magnetic resonance images. These analyses revealed highly reliable and focused activity in regions of inferior occipital-temporal cortex. These findings indicate that the earliest measurable correlates of discriminative operations in the visual system appear as neural activity in circumscribed regions of the ventral processing stream.




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