Hand laterality and cognitive ability: A multiple regression approach

Several different associations between hand laterality and cognitive ability have been proposed. Studies reporting different conclusions vary in their procedures for defining laterality, and several of them rely on measures which are statistically problematic. Previous methods for measuring relative...

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Bibliographic Details
Published in:Brain and cognition 2003-08, Vol.52 (3), p.390-398
Main Author: Nettle, Daniel
Format: Article
Language:English
Subjects:
Anatomical correlates of behavior
Behavioral psychophysiology
Biological and medical sciences
Child
Cognition - physiology
Female
Functional Laterality - physiology
Fundamental and applied biological sciences. Psychology
Handedness
Humans
Intelligence
Lateralization
Male
Neuropsychological Tests
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Regression Analysis
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Summary:Several different associations between hand laterality and cognitive ability have been proposed. Studies reporting different conclusions vary in their procedures for defining laterality, and several of them rely on measures which are statistically problematic. Previous methods for measuring relative hand skill have not satisfactorily separated the overall level of hand skill, which is a known correlate of cognitive ability, from the asymmetry of its distribution. This paper uses a multiple regression paradigm that separates these two components. Support is found for Leask and Crow’s [Trends in Cognitive Sciences, 5 (2001) 513] proposal that average cognitive ability increases monotonically with increasing strength of laterality, regardless of its direction. The small average advantage to dextrals stems from them being more strongly lateralised than sinistrals. The paucity of strong dextrals amongst the very gifted is due to a smaller variance in cognitive ability in this group.
ISSN:0278-2626
1090-2147
DOI:10.1016/S0278-2626(03)00187-8