Handedness and birth stress

Bakan P, Dibb G, Reed P

1973

Canada

The study involved giving a questionnaire to university students. Left handed and mixed handed individuals were twice as likely as right-handers to report complications when their mother was pregnant or when they were born. The ability of birth stressors to cause left handedness was much greater for males than for females.

This is one of the first studies of handedness from a primal health research perspective