Comparison between visual half-field performance and cerebral blood flow changes as indicators of language dominance

Laterality
S KrachW Hartje

Abstract

The determination of hemispheric language dominance (HLD) can be accomplished in two ways. One approach relies on hemispheric differences in cerebral blood flow velocity (CBFV) changes during language activity, while the other approach makes use of performance differences between the left and right visual field when verbal stimuli are presented in a tachistoscopic visual field paradigm. Since both methodologically different approaches claim to assess functional HLD, it seems plausible to expect that the respective laterality indices (LI) would correspond. To test this expectation we measured language lateralisation in 58 healthy right-handed, left-handed, and ambidextrous subjects with both approaches. CBFV changes were recorded with functional transcranial Doppler sonography (fTCD). We applied a lexical decision task with bilateral visual field presentation of abstract nouns and, in addition, a task of mental word generation. In the lexical decision task, a highly significant right visual field advantage was observed for number of correct responses and reaction times, while at the same time and contrary to expectation the increase of CBFV was significantly higher in the right than left hemisphere. During mental word generation...Continue Reading

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Citations

Jul 25, 2009·Laterality·Todd McElroy, Jonathan Corbin
Jul 27, 2007·Journal of Cognitive Neuroscience·Zoë R HunterStefan Knecht
Mar 5, 2016·Laterality·Marietta Papadatou-PastouChristine Mohr
Nov 26, 2008·Hormones and Behavior·Ulrike Bayer, Markus Hausmann
Mar 30, 2007·Brain Research·Philipp Kanske, Sonja A Kotz
Dec 26, 2007·Magnetic Resonance Imaging·Mohamed L Seghier
Nov 20, 2014·Frontiers in Psychology·David P Carey, Leah T Johnstone

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