Neurophysiological evidence for two processing times for visual object identification

Neuropsychologia
Haline E Schendan, M Kutas

Abstract

Event-related brain potentials (ERPs) were recorded to fragmented pictures of objects that were named correctly or were not to investigate the time course of visual object identification. The first ERP difference distinguishing identified from unidentified pictures estimates the upper limit of the time by which human brain regions have begun to activate long-term memory (LTM) representations specifying the identity of a visual object. Data from 15 young adults indicate that this time varies with the extent to which object parts are recoverable from the visual input, being approximately 200 ms earlier with recoverable than unrecoverable parts. Successful identification is evident by approximately 300 ms when object parts and overall structural configuration are readily recoverable but not until approximately 550 ms when object parts are difficult or impossible to recover (i.e. too poorly specified by the available contours to be recovered). In both cases, successful identification is associated with greater relative positivity. However, unidentified recoverable pictures are associated with an enhanced frontal negativity (N350), linked to object matching operations, not seen for non-recoverable pictures. Taken together, these res...Continue Reading

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Citations

Apr 2, 2003·Brain Research. Cognitive Brain Research·Giorgio Ganis, Marta Kutas
Jun 18, 2004·Psychological Science·David E Irwin, James R Brockmole
Feb 20, 2003·Journal of Cognitive Neuroscience·Haline E Schendan, Marta Kutas
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Oct 24, 2020·Scientific Reports·Dimitrios KourtisGünther Knoblich
Jul 24, 2021·Cerebral Cortex Communications·Manoj KumarDiane M Beck

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