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Block Building Task Identifies Distinct Groups of Left/Right-hand Choice Patterns After Unilateral Peripheral Nerve Injury

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The relationship between hand preference, hand performance, and general cognitive ability.

Michael E R Nicholls¹, Heidi L Chapman, Tobias Loetscher

¹Department of Psychology, University of Melbourne, Melbourne, Australia. mike.nicholls@unimelb.edu.au

Journal of the International Neuropsychological Society : JINS

|April 28, 2010

Summary

This summary is machine-generated.

Handedness influences cognitive ability, with moderate right-handers showing higher scores. This study suggests subtle links between hand performance and general cognitive ability (GCA) in large-scale research.

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Area of Science:

Neuroscience
Cognitive Psychology
Human Behavior

Background:

Handedness has long been theorized to correlate with cognitive abilities and personality traits.
Various models propose differing relationships, predicting outcomes from enhanced cognition in left-handers to reduced achievement in mixed-handers.

Purpose of the Study:

To test existing models linking handedness to cognitive ability.
To investigate the relationship between hand preference/performance and general cognitive ability (GCA).

Main Methods:

Utilized a sample of 895 participants from the BRAINnet database.
Administered a general cognitive ability (GCA) scale and a hand preference/performance test.

Main Results:

Moderate right-handers, based on performance, exhibited higher GCA scores than strong left- or right-handers.
Left-handers showed lower GCA compared to right-handers based on performance measures.
Hand preference data revealed minimal association with GCA, potentially due to extreme clustering.

Conclusions:

Findings support Annett's heterozygous advantage model, indicating a potential cognitive disadvantage for extreme handedness.
The study confirms a GCA disadvantage for left-handers.
Handedness is subtly related to cognitive ability, detectable in large studies with precise hand performance measures.