Can porn shrink the brain?
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The brains of men who watch lots of pornography tend to be smaller in certain key areas and have fewer connections than those of other men, a new study has found.
The differences appeared in a brain region called the striatum, which is associated with reward and motivation.
"Since the striatum is part of the brain network that is known to respond to sexual cues, one can assume that this reflects a blunting of the reaction to erotic stimuli," study co-author Simone Kühn, a psychologist at the Max Planck Institute for Human Development in Germany, wrote in an email to Live Science.
But although the findings are suggestive, it's not clear that watching porn actually causes men's brains to shrink. Perhaps men who watch a lot of porn are different in some underlying way from those who don't, and that could explain the smaller size, experts said.
Sexual disorder?
With the rise of the Internet, people can now anonymously access pornography at all hours of the day with just the click of a mouse. [Hot Stuff! 10 Unusual Sexual Fixations]
"This has fostered the pervasiveness of pornography use and raises the question of whether it has any effects on brain structure and function," Kühn said.
Some psychologists argue that porn-watching is harmless, while others claim porn is bad for mental health and can spiral into sex addiction. (The most recent version of the Diagnostic and Statistical Manual of Mental Disorders, the DSM-5, doesn't include sex addiction as a separate disorder.) [Top 10 Controversial Psychiatric Disorders]
A 2013 study in the journal Socioaffective Neuroscience and Psychology, found that people who reported problems controlling their urge to view sexual images did not display brain patterns that are characteristic of people with addictions.
But even behavior that doesn’t rise to the level of an addiction or disorder can still be problematic, said William Struthers, a neuroscientist at Wheaton College in Illinois, who was not involved in the new study.
"We now need to acknowledge that this fits somewhere on a pathological spectrum," with some people affected relatively little by porn, while others may have their relationships and life compromised, he said.
Brain scans
To assess the effect of pervasive porn watching on the brain, Kühn and her colleague, Jürgen Gallinat, a researcher at the Clinic for Psychiatry and Psychotherapy in Germany, placed 64 healthy men in a magnetic resonance imaging (MRI) scanner, and measured the men's responses to sexual and neutral images. On average, outside of the lab, the men watched about four hours of pornography a week, with some of the respondents watching nearly 20 hours a week and others watching none at all.
The avid porn watchers showed lower activation of reward circuitry in the brain (as suggested by lower blood flow to certain brain regions) in response to the sexual images.
When their brains were at rest, they also had smaller grey matter volume in areas of the brain, such as the striatum, associated with reward processing and motivation, compared with men who watched less porn.
Past research, detailed in 2012 in the Journal of Sexual Medicine, suggested watching porn can quiet a brain region that processes visual stimuli called the primary visual cortex.
http://www.livescience.com/46006-can-porn-shrink-brain.html