Several studies have shown that homosexual men have an increased prevalence of non-right-handedness and atypical patterns of hemispheric functional asymmetry. Non-right-handedness in men has been associated with increased size of the corpus callosum (CC), particularly of the isthmus, which is the posterior region of the callosal body connecting parietotemporal cortical regions. (Witelson, Sandra F., et al. Corpus Callosum Anatomy in Right-Handed Homosexual and Heterosexual Men. Archives of Sexual Behavior. Volume 37, Number 6(2008), 857-863, DOI: 10.1007/s10508-007-9276-y)

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