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Title: Chronometry of word and picture identification: Common and modality-specific effects
Authors: Van Doren, Leen
Schrooten, Maarten
Adamczuk, Kate
Dupont, Patrick
Vandenberghe, Rik # ×
Issue Date: Feb-2012
Publisher: Academic Press
Series Title: NeuroImage vol:59 issue:4 pages:3701-3712
Abstract: Based on a previous fMRI connectivity analysis, we previously proposed that long-distance connections between left inferior frontal sulcus and left occipitotemporal sulcus mediate access to visual short-term memory both for written words and pictures enhancing conscious perception and successful encoding in an amodal manner. Using a 64-channel event-related potential electrode system in 19 young cognitively intact volunteers, we determined the chronometry of common and input-modality specific effects of word and picture identification and subsequent memory retrieval. Stimulus durations were calibrated per subject, modality and run so as to reach a 50% positive identification report. The earliest main effect of a positive identification report occurred between 180 and 200ms, was common for both input-modalities, had a positive polarity and was located at around CPz. This effect was followed between 270 and 450ms by additional common positive-polarity effects at centrofrontal electrode sites and by common negative effects at P7/P8, TP7/TP8 and T8. Each of the later effects was closely associated not only with identification but also with subsequent memory retrieval. The earliest input-modality specific effect of conscious identification that we detected occurred from 280 till 440ms at P8. Our findings are in line with a model where the initial stages of perceptual identification and visual short-term memory access rely on long-distance connections that are shared between written words and pictures.
URI: 
ISSN: 1053-8119
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory for Cognitive Neurology
Research Group Experimental Neurology
× corresponding author
# (joint) last author

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