Related Experiment Videos
Summary
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.
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.
- 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.