Patterns of Handedness in Modern Japanese: A Cohort Effect Shown by Re-administration of the H. N. Handedness Inventory After 20 Years.

Abstract

The H.N. Handedness Inventory, originally administered to a sample of 1199 Japanese students in 1973, was administered to a new sample of 1700 Japanese students 20 years later. It was found that the population of left-handed and ambidextrous females had increased. The incidence of inverted left-hand writers was very small. Comparison of the two sets of data demonstrates the effects of non-biological factors upon lateral preference.