Hand preference and age in the United States.

摘要: A survey of 1,177,507 U.S. men and women between the ages 10 86 included questions regarding hand preference for writing throwing. Three effects were observed. Individuals with at least some left motoric bias comprised a smaller percent population advancing age. This finding provides large-scale confirmation previously described phenomenon. Among sinistrals, concordance throwing was 2.2 times as prevalent left-writing right-throwing, 4.1 right-writing left-throwing. These sinistral subpopulations displayed distinct stable prevalence prior to age 50 changing patterns subsequent 50. The results confirm decrease in sinistrality, but indicate that age-specific rates mixed- left-handedness are distinct. implications hypotheses age-related change sinistrality discussed.