title: Hemispheric asymmetry of arterial blood flow velocity changes during verbal and visuospatial tasks.
abstract: Changes in arterial blood flow velocity induced by cognitive activity were measured by simultaneous bilateral transcranial Doppler sonography (TCD) of the posterior and the middle cerebral artery. The finding of a robust left hemisphere dominance for verbal tasks but of an inconsistent right hemisphere dominance for visuospatial tasks obtained in an earlier study [13], in which TCD measurement had been restricted to the middle cerebral arteries, was confirmed. At the same time, it could be demonstrated that the failure to find the expected right hemisphere dominance for tasks of spatial visualization and mental rotation extended to the TCD measurement of the posterior cerebral arteries.
authors.affiliation: Department of Psychology, University of Bielefeld, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Bulla-Hellwig
authors.forename: J
authors.initials: J
authors.lastname: Vollmer
authors.forename: A
authors.initials: A
authors.lastname: Götzen
authors.forename: W
authors.initials: W
authors.lastname: Skreczek
authors.forename: W
authors.initials: W
authors.lastname: Hartje
mesh_terms: D000328:Adult; D001921:Brain / Q000098:blood supply*; D003071:Cognition; D005260:Female; D007839:Functional Laterality; D006801:Humans; D008297:Male; D013037:Spatial Behavior; D013067:Speech Perception; D014796:Visual Perception