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Hand skill and hand–eye preference in relation to verbal ability in healthy adult male and female right-handers

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Verbal as well as non-verbal performances were investigated in relation to both hand skill assessed by finger-tapping performances and hand–eye preference in 83 healthy adult right-handers, most of them students. The primary objective of this study was to show better finger-tapping performances in right-handed participants with best verbal IQ values. We found that it was not the non-verbal but the verbal abilities that were related to finger-tapping performances. This was proven, especially as to the left-hand taps. Faster left-hand taps in participants with higher verbal IQ values may be due to a closer cooperation of right-hemispheric regions in information processing and an intimate relationship between language and finger-motor functions. Secondary objectives assessed by explorative data analyses included gender differences and hand–eye preference. While in the females left-hand taps correlated somewhat more with verbal IQ values, in the males this effect was seen in selected variables of the right-hand taps. Moreover, laterality assessed in finger-tapping performances may not be in accordance with laterality found in the handedness questionnaire. In addition to this, congruent hand–eye dominance was found to be slightly more prevalent in participants with best verbal IQ values. However, these findings will have to be confirmed in further experiments.
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Document Type: Research Article

Affiliations: 1: Charité-Universitätsmedizin Berlin, Germany 2: Sächsisches Krankenhaus Altscherbitz, Schkeuditz, Germany

Publication date: September 1, 2006

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