Steady state visually evoked potential (SSVEP) topography in a graded working memory task

Citation
Rb. Silberstein et al., Steady state visually evoked potential (SSVEP) topography in a graded working memory task, INT J PSYCP, 42(2), 2001, pp. 219-232
Citations number
57
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Psycology,"Neurosciences & Behavoir
Journal title
INTERNATIONAL JOURNAL OF PSYCHOPHYSIOLOGY
ISSN journal
0167-8760 → ACNP
Volume
42
Issue
2
Year of publication
2001
Pages
219 - 232
Database
ISI
SICI code
0167-8760(200110)42:2<219:SSVEP(>2.0.ZU;2-2
Abstract
The steady state visually evoked potential (SSVEP) elicited by a diffuse 13 -Hz visual flicker was recorded from 64 scalp sites in 30 subjects performi ng a low and high demand version of an object working memory task. During t he perceptual component of the task, the SSVEP amplitude was reduced at lef t and right parieto-occipital sites. During the hold or memory component of the task, the SSVEP amplitude exhibited a load-dependent increase at front al and occipito-parietal sites, while the SSVEP latency exhibited a load-de pendent reduction at central and left frontal sites. We suggest that SSVEP amplitude changes index cortical information processing modes in that perce ptual processes are associated with an SSVEP amplitude reduction, while hol ding information in active short-term or working memory is associated with an SSVEP amplitude increase. We also discuss changes in SSVEP amplitude and latency in terms of changes in the behavior of cortico-cortico and thalamo -cortico loops that utilize cortical layer I. Such cortico-cortico and thal amo-cortical loops are also proposed to constitute a neurophysiological mec hanism for holding information in working memory. (C) 2001 Elsevier Science B.V. All rights reserved.