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Viewpoints

Neuroscience and Sex/Gender: Looking Back and Forward

Melissa Hines
Journal of Neuroscience 5 September 2019, 0750-19; DOI: https://doi.org/10.1523/JNEUROSCI.0750-19.2019
Melissa Hines
Department of Psychology, University of Cambridge, Cambridge CB2 3RQ, United Kingdom
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Abstract

Phoenix et al. (1959) reported that treating pregnant guinea pigs with testosterone had enduring effects on the sex-related behavior of their female offspring . Since then, similar enduring effects of early testosterone exposure have been found in other species, including humans, and for other behaviors that show average sex differences. In humans, the affected outcomes include gender identity, sexual orientation, and children’s sex-typical play behavior. The evidence linking early testosterone exposure to sex-typed play is particularly robust, and sex-typed play is also influenced by many other factors, including socialization by parents and peers and self-socialization, based on cognitive understanding of gender. In addition to influencing behavior, testosterone and hormones produced from testosterone affect mammalian brain structure. Studies using human autopsy material have found some sex differences in the human brain similar to those seen in other species, and have reported that some brain sex differences correlate with sexual orientation or gender identity, although the causes of these brain/behavior relationships are unclear. Studies that have imaged the living human brain have found only a small number of sex differences, and these differences are generally small in magnitude. In addition, they have not been linked to robust psychological or behavioral sex differences. Future research might benefit from improved imaging technology, and attention to other brain characteristics. In addition, it might usefully explore how different types of factors, such as early testosterone exposure and parental socialization, work together in the developmental system that produces sex/gender differences in human brain and behavior.

Footnotes

  • The authors declare no competing financial interests.

  • This work was supported in part by National Institutes of Health Research Grant R01HD-081720. I thank Debra Spencer for help with creating figures for the manuscript.

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Neuroscience and Sex/Gender: Looking Back and Forward
Melissa Hines
Journal of Neuroscience 5 September 2019, 0750-19; DOI: 10.1523/JNEUROSCI.0750-19.2019

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Neuroscience and Sex/Gender: Looking Back and Forward
Melissa Hines
Journal of Neuroscience 5 September 2019, 0750-19; DOI: 10.1523/JNEUROSCI.0750-19.2019
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JNeurosci   Print ISSN: 0270-6474   Online ISSN: 1529-2401

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