Titterzz quicky 26-1-2011: Are brains of lesbians different from heterosexual women? Do they look more like masculine brains? To test this hypothesis, a single performance measure was used: dichotic listening performance. So, this doesn’t account for all brain processes! Results show that lesbian brains do not differ significantly from female heterosexual ones, but look more like male heterosexual brains than their female counterparts. Read this article in: Archives of Sexual Behavior, 2008, 37(4), 566-571. By:
Qazi Rahman, Anna Cockburn and Ernest Govier
This study tested dichotic listening performance, a measure of functional cerebral asymmetry previously shown to be sexually dimorphic, in homosexual women (n=23), heterosexual women (n=27), and heterosexual men (n=24). All participants completed a verbal consonant-vowel dichotic listening task. On three laterality indices, heterosexual men displayed a significantly greater right-ear advantage compared to heterosexual women only. Homosexual women did not differ significantly from heterosexual men or from heterosexual women. Post-hoc comparisons (with a statistical correction) for each ear separately showed that heterosexual men displayed significantly greater right-ear scores compared to heterosexual women only. These data suggest that lesbian women are somewhat masculinized in their functional cerebral asymmetry. The results were interpreted in the context of sexual variation in models of linguistic hemispheric processing.
Keywords Sexual orientation - Lesbians - Dichotic listening - Hemispheric processing
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