Handedness: Manual Lateral Parameter – or the Result of the Researcher’s Manipulation
The purpose of the research was to compare different methods of handedness assessment. Participants included 161 children between 4 and 7 years of age: 87 girls and 74 boys. The research incorporated typical methods used in investigations and assessment of lateral phenotype. All tests were repeated at least three times to assess their reliability in assessing children. Our findings reveal that different sets of assessments and scoring methods produced different results in determination of right- or left-handedness. Factor analysis identified three significant factors of handedness: social pressure, genetic mechanisms, and two-hand coordination. We conclude that it is necessary for assessment of handedness to use at least three tests
associated with each of these factors.
Keywords: handedness, left-handedness, methods, lateral profile, children.
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