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A difference in hypothalamic structure between heterosexual and homosexual men.

S LeVay1

  • 1Salk Institute for Biological Studies, San Diego, CA 92186.

Science (New York, N.Y.)
|August 30, 1991
PubMed
Summary

The interstitial nuclei of the anterior hypothalamus (INAH) 3 cell group was significantly larger in heterosexual men than in homosexual men and women. This finding suggests a biological basis for sexual orientation in men.

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Area of Science:

  • Neurobiology
  • Human Sexuality
  • Endocrinology

Background:

  • The anterior hypothalamus plays a crucial role in regulating male sexual behavior.
  • Previous research indicated potential differences in brain structures between sexes.
  • The interstitial nuclei of the anterior hypothalamus (INAH) are key areas of interest.

Purpose of the Study:

  • To investigate whether specific cell groups within the anterior hypothalamus differ in volume between women, heterosexual men, and homosexual men.
  • To explore the potential dimorphism of INAH 1-4 based on sexual orientation.
  • To identify potential biological correlates of sexual orientation.

Main Methods:

  • Postmortem brain tissue analysis from three groups: women, heterosexual men, and homosexual men.
  • Measurement of the volumes of four specific cell groups: INAH 1, INAH 2, INAH 3, and INAH 4.
  • Comparative statistical analysis of INAH volumes across the subject groups.

Main Results:

  • No significant differences in the volumes of INAH 1, INAH 2, or INAH 4 were observed between the groups.
  • INAH 3 was found to be more than twice as large in heterosexual men compared to women.
  • INAH 3 was also more than twice as large in heterosexual men compared to homosexual men.

Conclusions:

  • The volume of INAH 3 is dimorphic with respect to sexual orientation in men.
  • These findings suggest a potential biological substrate underlying sexual orientation.
  • The study highlights the anterior hypothalamus as a key region for understanding human sexual orientation.

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