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(Journal of Cognitive Neuroscience. 2000;12:615-621.)
© 2000 The MIT Press

Article

Activation Timecourse of Ventral Visual Stream Object-recognition Areas: High Density Electrical Mapping of Perceptual Closure Processes

Glen M. Doniger, John J. Foxe, Micah M. Murray, Beth A. Higgins, Joan Gay Snodgrass, Charles E. Schroeder and Daniel C. Javitt

New York University and Nathan Kline Institute for Psychiatric Research
Albert Einstein College of Medicine and Nathan Kline Institute for Psychiatric Research
New York University
Nathan Kline Institute for Psychiatric Research and New York University School of Medicine

Reprint requests should be sent to John J. Foxe, Cognitive Neurophysiology Laboratory, Nathan Kline Institute for Psychiatric Research, Program in Cognitive Neuroscience and Schizophrenia, 140 Old Orangeburg Road, Orangeburg, NY 10962, USA. Tel.: +1-914-398-6538; fax: +1-914-398-6545; e-mail: foxey{at}balrog.aecom.yu.edu

Object recognition is achieved even in circumstances when only partial information is available to the observer. Perceptual closure processes are essential in enabling such recognitions to occur. We presented successively less fragmented images while recording high-density event-related potentials (ERPs), which permitted us to monitor brain activity during the perceptual closure processes leading up to object recognition. We reveal a bilateral ERP component (Ncl) that tracks these processes (onsets ~ 230 msec, maximal at ~ 290 msec). Scalp-current density mapping of the Ncl revealed bilateral occipito-temporal scalp foci, which are consistent with generators in the human ventral visual stream, and specifically the lateral-occipital or LO complex as defined by hemodynamic studies of object recognition.




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