Data from a longitudinal study of twin children and siblings, 155 girls and 134 boys (aged 4 to 9 yr.), on a torque test confirmed that during this age period manually produced circling patterns change from clockwise to counterclockwise orientation. A genetic influence is suggested.
Get full access to this article
View all access options for this article.
References
1.
BlauT.Torque and schizophrenic vulnerability. American Psychologist, 1977, 32, 997–1005.
2.
BrunerJ. S.Organization of early skilled action. Child Development, 1973, 44, 1–11.
3.
HaggardE. A.Intraclass correlation and the analysis of variance. New York: Dryden, 1958.
4.
ReissA. J.Jr.Occupations and social status. New York: Free Press of Glencoe, 1961.
5.
TannerJ. M.Physical growth. In MussenP. H. (Ed.), Carmichael's ‘Manual of child psychology.’New York: Wiley, 1970. Pp. 77–155.
6.
VandenbergS. G.The hereditary abilities study: Hereditary components in a psychological test battery. American Journal of Human Genetics, 1962, 14, 220–237.
7.
VandenbergS. G.Contributions of twin research to psychology. Psychological Bulletin, 1966, 66, 327–352.
