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| Research article summary (published 22 Mar 2003): |
Interference with vision by TMS over the occipital pole: a fourth period.
Full Abstract
We investigated the effect of single-pulse transcranial magnetic stimulation (TMS) over the occipital pole on a forced-choice visual letter-identification task. Magnetic stimuli were applied on the midline but with the initial current directed pseudorandomly toward either left or right hemisphere; visual stimuli were presented randomly in either left or right hemifield; magnetic-visual stimulus onset asynchrony varied randomly between 12 values:
-500 ms and from -50 ms to +50 ms in 10 ms steps. The data revealed the existence of a hitherto unknown fourth task-interfering TMS effect that was maximal at -10 ms and specific for magnetic stimulus polarity and visual stimulus location. This -10 ms effect cannot be explained by reflex blinking (as the -50 ms effect can) and direct disruption of letter-induced activity (as the +20 ms and +100 ms effects can), but it could be explained by direct disruption of pre-letter activity or indirect disruption of letter-induced activity.
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Author information
Author/s: Corthout, Erik (E); Hallett, Mark (M); Cowey, Alan (A);
Affiliation: Department of Experimental Psychology, University of Oxford, Oxford, UK. erik.corthout@lincoln.ox.ac.uk
Journal and publication information
Publication Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't
Journal: Neuroreport (Neuroreport), published in England. (Language: eng)
Reference: 2003-Mar; vol 14 (issue 4) : pp 651-5
Dates: Created 2003/03/26; Completed 2003/05/29; Revised 2006/11/15;
PMID: 12657905, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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