Götestam K O, Coates T J, Ekstrand M
University of Trondheim, Department of Psychiatry and Behavioural Medicine, Ostmarka Hospital, Norway.
Int J Neurosci. 1992 Apr;63(3-4):179-86. doi: 10.3109/00207459208987193.
A study of handedness, dyslexia, stuttering and twinning, was included in a study of sexual habits of homosexual men. A questionnaire was mailed to homosexuals, and 394 forms suitable for data analysis were received. The results showed an increased rate of lefthand writing (17.5% compared to 8-8.4%), and a clear left shift. There were increased occurrence of both stuttering (7.1% compared to 1.6%) and reading difficulties (7.9% compared to 1-3%). The incidence of twins was lower than the population (1.3%). The results confirm earlier attempts to show a left shift in homosexuals, and support Geschwind's hypotheses about etiological factors for both lefthandedness and homosexuality.
