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Patterns of brain activation during visually evoked sexual arousal differ between homosexual and heterosexual men.

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Patterns of brain activation during visually evoked sexual arousal differ between homosexual and heterosexual men.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Hu, S-H Wei, N. Wang, Q-D Yan, L-Q Wei, E-Q Zhang, M-M Hu, J-B Huang, M-L Zhou, W-H Xu, Y.
Description	Country affiliation: China Author Affiliation: Hu SH ( Department of Mental Health, First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China.)
Abstract	BACKGROUND AND PURPOSE: Nowadays the mechanism of homosexuality is little known. Few studies have been carried out to explore the brain functional changes of homosexual men during sexual arousal. We used functional MR imaging (fMRI) to determine whether the patterns of brain activation in homosexual and heterosexual men differed during visually evoked sexual arousal. MATERIALS AND METHODS: To all the subjects (10 homosexual and 10 heterosexual), real-time visual stimulation was provided by 3-minute exposure to 3 types of erotic film: heterosexual couples (F-M), male homosexual couples (M-M), and female homosexual couples (F-F) engaged in sexual activity, during which time fMRI was used to determine the patterns of brain activation. Self-reports of level of sexual arousal were collected immediately afterward. RESULTS: Statistical parametric mapping showed that viewing erotic film excerpts that induced sexual arousal was associated, in both groups, with activation of the middle prefrontal gyrus, bilateral temporal lobe and postcentral gyrus, thalamus, insula, vermis, left precuneus, occipital cortex, parietal cortex, and cerebellum. In homosexual men, the left angular gyrus, left caudate nucleus, and right pallidum were activated; in contrast, heterosexual men showed no activation in these regions. However, heterosexual men showed activation in the bilateral lingual gyrus, right hippocampus, and right parahippocampal gyrus, areas not activated in homosexual men. In both groups, region-of-interest analysis revealed no correlation between the magnitude of amygdala or thalamus activation and the reported level of sexual arousal. CONCLUSION: Our findings indicate that different neural circuits are active during sexual arousal in homosexual and heterosexual men and may contribute to a better understanding of the neural basis of male sexual orientation.
File Format	HTM / HTML
ISSN	01956108
e-ISSN	1936959X
Journal	American Journal of Neuroradiology
Issue Number	10
Volume Number	29
Language	English
Publisher	American Journal of Neuroradiology
Publisher Date	2008-11-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Neurology Discipline Radiology Arousal Physiology Brain Evoked Potentials, Visual Heterosexuality Homosexuality, Male Magnetic Resonance Imaging Sexual Behavior Brain Mapping Pattern Recognition, Automated
Content Type	Text
Resource Type	Article
Subject	Radiology, Nuclear Medicine and Imaging Neurology (clinical)

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