Abstract
On the basis of both Geschwind andBehan's (1984) theory—that at least part of the genesis of left-handedne ss can be ascribed to overexposure to testosterone during fetal development—andDorner's (1980;Dorneretal., 1991) theory—that transsexuality emerges from prenatal over- or underexposure to androgens infemale-to-male (FTM) andmale-to-female (MTF) transsexuals, respectively—it was predicted that thefrequency of left-handedne ss in FTM transsexuals would be higher than in the general population. In MTF transsexuals, by contrast, thefrequency of left-handedne ss was expected to be lower or the same as in the general population. Results showed that the prevalence of left- handedness in both FTM and MTF transsexuals is nearly two times higher than in the general population. The generally higher prevalence of left-handedne ss among trans- sexuals, combined with the absence of the predicted sex difference, indicates that either Dorner's theory on the etiology of transsexuality or Geschwind's model of the genesis of left-handedness, or both, need to be revised.
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