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Masculinization effects in the auditory system.

Dennis McFadden1

  • 1Department of Psychology, Institute for Neuroscience, University of Texas, Austin, Texas 78712-1189, USA. mcfadden@psy.utexas.edu

Archives of Sexual Behavior
|March 26, 2002
PubMed
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Masculinized auditory evoked potentials (AEPs) and otoacoustic emissions (OAEs) in special populations suggest prenatal androgen exposure. These findings may indicate localized, nonmonotonic androgen effects during development.

Area of Science:

  • Neuroscience
  • Endocrinology
  • Audiology

Background:

  • Otoacoustic emissions (OAEs) and auditory evoked potentials (AEPs) are objective measures of auditory system function.
  • Previous research indicates variations in OAEs and AEPs in specific populations, but underlying causes are not fully understood.

Purpose of the Study:

  • To investigate potential links between androgen exposure and auditory function measures (OAEs and AEPs) in special populations.
  • To explore the hypothesis that developmental androgenization influences auditory system characteristics.

Main Methods:

  • Comparative analysis of OAEs and AEPs in various subject groups, including females with opposite-sex co-twins (OSDZ females), homosexual and bisexual females, and homosexual males.
  • Assessment of auditory function metrics across these groups.

Related Experiment Videos

Main Results:

  • Masculinized OAEs were observed in OSDZ females, and homosexual and bisexual females.
  • Masculinized AEP measures were found in homosexual and bisexual females, and hypermasculinized AEPs in homosexual males.
  • These auditory differences correlate with potential heightened androgen exposure during development.

Conclusions:

  • Developmental androgen exposure, possibly prenatal, may explain observed differences in OAEs and AEPs in these special populations.
  • Androgen effects on the auditory system might be spatially and temporally localized, with potential nonmonotonic dose-response relationships.