The belief that men are more likely to get turned on by sexual images than women may be something of a fantasy, according to a study suggesting brains respond to such images the same way regardless of biological sex. Writing in the Proceedings of the National Academy of SciencesNoori and his colleagues report how they came to their conclusions by analysing the results of 61 published studies involving adults of different biological sex and sexual orientation.
The women were shown everyday images of people as well as erotic images while they lay inside a brain-scanning machine. Noori said all participants rated the sexual images as arousing before being scanned.
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Previously studies based on self-reporting have suggested men are more aroused by images sex women, and it has been proposed that these differences could be down to the way the brain processes the stimuli — but studies have returned different man. Now, looking at the whole body of research, Noori and his colleagues say they have found little sign of functional differences.
For both biological sexes, a change in activity was seen in the same brain regions including the amygdala, with and striatum when sexual images were shown. However, activity was more widespread in the case of explicit pictures than video, and there were some small differences in the regions activated linked to sexual orientation.
The team also analysed more than women published studies to explore whether there were differences between the biological sexes in the volume of grey matter in the insula and anterior cingulate — a previous study had suggested this may be linked to levels of sexual arousal.
However, the vast majority of the studies considered did not find any difference in the volume of grey matter in sex regions between the sexes. The few that did suggested women have a greater volume of grey matter in these regions than men. The authors say differences in with way the brains of men and women respond to erotic images may have been overstated, with previous research possibly affected by small sample sizes or different attitudes to the material among participants.
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But questions remain. The latest study was not able to look at whether the magnitude of the changes of brain activity were the same for man biological sexes. But the study casts doubt on the notion. Topics Neuroscience.
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