What do Sex, Twins, Spotted Hyenas, ADHD, and Sexual Orientation Have in Common?
Posted: July 1, 2008
DENNIS MCFADDEN'S research on otoacoustic emissions (OAEs), to be published in the July 2008 issue of Perspectives on Psychological Science, is featured on the APS (Association for Psychological Science) website. Mcfadden's lab has been examining the use of simple, noninvasive measures to reveal the invisible processes of human prenatal development. The primary measures have come from the auditory system: otoacoustic emissions, which are sounds produced in the inner ear, and auditory evoked potentials, which are brainwaves evoked by acoustic stimuli. Both of these measures appear to be affected by how much exposure to testosterone a fetus receives during prenatal development. Dr. McFadden and his long-time collaborator, Edward Pasanen, have obtained auditory measures from opposite-sex and same-sex twins, ADHD and non-ADHD children, heterosexual and nonheterosexual males and females, and normal and androgen-treated spotted hyenas, rhesus monkeys, and sheep.