PSYCOLOQUY Commentary is invited on:
Fitch & Denenberg on SEX DIFFERENCES IN THE BRAIN
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psycoloquy.95.6.05.sex-brain.1.fitch
ISSN 1055-0143 (56 paragraphs, 93 references, 1159 lines)
PSYCOLOQUY is sponsored by the American Psychological Association (APA)
Copyright 1995 Fitch and Denenberg
A ROLE FOR OVARIAN HORMONES IN SEXUAL
DIFFERENTIATION OF THE BRAIN
Roslyn Holly Fitch
Center for Molecular and Behavioral Neuroscience
Rutgers University
197 University Ave.
Newark, NJ 07102
Email: holly(a)axon.rutgers.edu
Victor H. Denenberg
Biobehavioral Sciences Graduate Degree Program
University of Connecticut
Storrs, CT 06269-4154
Email: dberg(a)uconnvm.uconn.edu
ABSTRACT: The role of endogenous hormones in differentiating the
sexes is an area of continuing research. The bulk of findings in
this field support the notion that mammalian sexual differentiation
is primarily mediated by androgens of testicular origin and that
the presence of these androgens in early life produces a "male"
brain. In contrast, the female brain is thought to develop via a
hormonal default mechanism, in the absence of androgen. Findings
are reviewed which show that ovarian hormones also play a
significant role in sexual differentiation, and that the process of
ovarian feminization has a considerably later sensitive period than
androgen-mediated masculinization.
KEYWORDS: corpus callosum, development, estrogen, feminization,
ovaries, sensitive period.
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