Handedness classification: preference versus proficiency.

Area of Science:

• Neuroscience
• Human Motor Control
• Psychology

Background:

• Hand preference is commonly assessed via questionnaires.
• Manual proficiency can vary significantly with task complexity.
• The relationship between self-reported hand preference and actual performance is not fully understood.

Purpose of the Study:

• To investigate the correlation between questionnaire-based hand preference and objective measures of manual proficiency.
• To determine if this relationship changes across different levels of task difficulty.

Main Methods:

• Sixty-three adults completed hand preference questionnaires.
• Manual proficiency was assessed at three difficulty levels.
• Relative hand proficiency scores were analyzed for stability and correlation with questionnaire data.

Main Results:

• High test-retest reliability (.831–.893) and inter-trial stability (.879–.887) were found for manual proficiency measures.
• Spearman correlations between questionnaire responses and manual proficiency ranged from .619 to .733.
• The correlation decreased as task difficulty increased, with R² of only .38 at the highest difficulty level.

Conclusions:

• Questionnaire-based hand preference is a weak predictor of manual proficiency, particularly for tasks of moderate to high difficulty.
• Objective assessment of manual skill is necessary for accurate evaluation, as self-reported preference may not reflect actual capability.