Hemispheric asymmetry in visuospatial attention assessed with transcranial magnetic stimulation

Müri, René Martin; Bühler, Robert; Heinemann, Dörthe; Mosimann, Urs Peter; Felblinger, J.; Schläpfer, Thomas E.; Hess, Christian Walter (2002). Hemispheric asymmetry in visuospatial attention assessed with transcranial magnetic stimulation. Experimental brain research, 143(4), pp. 426-430. Springer-Verlag 10.1007/s00221-002-1009-9

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Transcranial magnetic stimulation (TMS) was used to study visuospatial attention processing in ten healthy volunteers. In a forced choice recognition task the subjects were confronted with two symbols simultaneously presented during 120 ms at random positions, one in the left and the other in the right visual field. The subject had to identify the presented pattern out of four possible combinations and to press the corresponding response key within 2 s. Double-pulse TMS (dTMS) with a 100-ms interstimulus interval (ISI) and an intensity of 80% of the stimulator output (corresponding to 110-120% of the motor threshold) was applied by a non-focal coil over the right or left posterior parietal cortex (PPC, corresponding to P3/P4 of the international 10-20 system) at different time intervals after onset of the visual stimulus (starting at 120 ms, 270 ms and 520 ms). Double-pulse TMS over the right PPC starting at 270 ms led to a significant increase in percentage of errors in the contralateral, left visual field (median: 23% with TMS vs 13% without TMS, P=0.0025). TMS applied earlier or later showed no effect. Furthermore, no significant increase in contra- or ipsilateral percentage of errors was found when the left parietal cortex was stimulated with the same timing. These data indicate that: (1) parietal influence on visuospatial attention is mainly controlled by the right lobe since the same stimulation over the left parietal cortex had no significant effect, and (2) there is a vulnerable time window to disturb this cortical process, since dTMS had a significant effect on the percentage of errors in the contralateral visual hemifield only when applied 270 ms after visual stimulus presentation.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Neurology > Centre of Competence for Psychosomatic Medicine
04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Neurology
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > Forschungsbereich Pavillon 52 > Forschungsgruppe Perzeption und Okulomotorik
04 Faculty of Medicine > University Psychiatric Services > University Hospital of Geriatric Psychiatry and Psychotherapy
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > DCR Unit Sahli Building > Forschungsgruppe Neurologie

UniBE Contributor:

Müri, René Martin; Bühler, Robert; Heinemann, Dörthe; Mosimann, Urs Peter; Schläpfer, Thomas E. and Hess, Christian Walter

Subjects:

600 Technology > 610 Medicine & health

ISSN:

0014-4819

Publisher:

Springer-Verlag

Language:

English

Submitter:

Pascal Wurtz

Date Deposited:

01 Sep 2014 09:15

Last Modified:

26 Jun 2018 13:08

Publisher DOI:

10.1007/s00221-002-1009-9

PubMed ID:

11914787

Uncontrolled Keywords:

TMS, Human, Attention, Parietal lobe

BORIS DOI:

10.7892/boris.43043

URI:

https://boris.unibe.ch/id/eprint/43043

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