This journal article discusses the anatomical differences of the corpus callosum (CC) in the brains of right-handed homosexual and heterosexual males. Various studies show that homosexual men have a higher tendency of left-handedness, which is associated with increased size of the isthmus of the corpus callosum, which is the part of the CC that connects two regions. Participants of this particular study, which included both homosexual and heterosexual men, underwent MRIs, from which the isthmus of the corpus callosum was traced and measured. The participants also underwent cognitive tests and hand preference tests. The results showed that the CC isthmus was larger in the homosexual males, but there was no significant difference in the cognitive tests. However, the homosexual participants did score lower in the left hand performance tests. Despite apparent hand preference, the size of the CC isthmus in homosexual men suggests that their brain structure and organization is closer to that of left-handers. For more detail, please see attached article:
http://www.springerlink.com/content/n462n4382243n412/
-Amanda Ranusch
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