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Handedness in two generations.

Perceptual and Motor Skills

|June 1, 1983

Summary

This summary is machine-generated.

This study found fewer left-handed responses in older generations compared to younger ones. Specific questionnaire items like toothbrush use better indicate left-handedness in older adults than writing or drawing.

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Area of Science:

Psychology
Human Development
Sociology

Background:

Handedness prevalence may vary across generations.
Traditional methods for assessing handedness might be less effective in older populations.

Purpose of the Study:

To compare left-handedness prevalence between parental and younger generations.
To identify reliable questionnaire items for assessing left-handedness in different age groups.

Main Methods:

A 14-item questionnaire was administered to 508 subjects in the parental generation and 917 younger subjects.
Item analysis was conducted using data from an additional 69 non-right-handers.

Main Results:

Significantly fewer left-handed responses were reported by the parental generation for every item.

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The questionnaire identified more left-handers than writing hand, but ascertainment was incomplete in the parental group (5.9% vs 11.8%).

Writing and drawing were unsuitable items for older subjects; toothbrush use, hammer use, and pouring were better indicators.

Conclusions:

Left-handedness prevalence appears lower in older generations, potentially due to incomplete ascertainment.
Specific daily activities, such as toothbrush use, are more reliable indicators of left-handedness in older adults than tasks like writing or drawing.