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| Research article summary (published 30 May 2003): |
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Single-pulse transcranial magnetic stimulation of parietal and prefrontal areas in a memory delay arm pointing task.
Full Abstract
Fifteen healthy volunteers performed a memory-pointing task using their right arm while single-pulse transcranial magnetic stimulation (TMS) above motor threshold was applied over the posterior parietal or prefrontal cortex of the left or right hemisphere in four blocks of trials. The stimulation was randomly delivered at one of three time intervals during the 3-s delay period (early:
300 ms, intermediate:
1,500 ms, late:
2,700 ms). A separate block with no stimulation was used as control. Only early left parietal stimulation resulted in an increase in the variance of movement amplitude but not direction for all targets in two-dimensional space (both hemifields). The results point to the significance of the contralateral posterior parietal cortex early on during the memorization of the target for an upcoming movement. Taking into consideration the limitations of TMS and those imposed by the particular task, the lack of specific effects of prefrontal stimulation provides evidence that these areas might not be involved in the performance of simple memorized arm movements.
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Author information
Author/s: Smyrnis, Nikolaos (N); Theleritis, Christos (C); Evdokimidis, Ioannis (I); Müri, Rene M (RM); Karandreas, Nikos (N);
Affiliation: Cognition and Action Group, Neurology and Psychiatry Department, National University of Athens, Aeginition Hospital, Athens GR-11528, Greece. smyrnis(-atsign-)med.uoa.gr
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't
Journal: Journal of neurophysiology (J Neurophysiol), published in United States. (Language: eng)
Reference: 2003-Jun; vol 89 (issue 6) : pp 3344-50
Dates: Created 2003/06/04; Completed 2003/08/01; Revised 2006/11/15;
PMID: 12783961, 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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