It can drive you to mate, unless you'd rather fight about it. (Photo Credit: CC BY-SA/Matthew Yglesias/Flickr)

A study published in the Feb. 9 issue of Nature indicates that sex and violence are intertwined in the male brain. Deep within the brain of male mice is a circuit of cells that determine whether they fight or mate. Neuroscientists believe that human brains are wired similarly.

Stimulating sex drive and aggression

Measuring a certain cluster of neurons within the ventromedial hypothalamus (VMH) of male mice, Dr. Dayu Lin of New York University and Dr. David Anderson of the California Institute of Technology in Pasadena found that sexual behavior and violent behavior triggered that same part of the brain. Unstimulated, mice would ignore males they would normally attack. Activated via a mild, targeted electric pulse, the same mice would assault both inanimate objects and females they were courting.

Sex and fights cause same brain response

Expanding the study, Lin and Anderson’s team monitored the male test mice during encounters with male and female mice. Using a fluorescent tag that reveals which neurons are most active, the neuroscientists made the discovery that the same area of the VMH lit up during fights and sex.

Next, Lin and Anderson used optogenetic techniques in which they inserted a gene into the test mice’s brains that made them susceptible to blue light. With the light, the scientists could fire the neurons in question on demand. Blue light activation prompted aggression, but if the mice were already in the middle of a sex act, the blue light had no observable effect.

“It’s kind of in its own world. It doesn’t listen to anything else,” Dr. Lin said.

Sex and violence: A natural link

Dr. Clifford Saper of Harvard Medical School points out that sex and violence are inseparably linked in a chain that leads to the survival of a species. The mice fought off invading males to preserve territory, and they had sex with females to pass on their genetic line. Even in humans, stimulation of the VMH is known to produce aggressive behavior. Dr. Newton Canteras of the University of São Paulo in Brazil believes further study will reveal that sexual behavior is centered in the same area of the human hypothalamus. Such knowledge may also help scientists understand and treat violent sex criminals.


Scientific American:

Know your sexy, fighting hypothalamus

Post By bryanh (1,420 Posts)


Do you have a fantastic idea related to this article, but just don't have the money you need to start your own company or side-business? Get the loans you need from to help get your new company underway, from the small loan professionals at PersonalMoneyNetwork.


Share this article

PG&E to pay $70 million for pipeline tragedy

PG&E to pay $70 million for pipeline tragedy

Pacific Gas and Electric Co., a northern California utility, has agreed to pay $70 million to the California town of San Bruno for a pipeline explosion that killed eight people in 2010. Company says it’s remorseful The San Francisco-based power company’s president, Chris Johns, released a statement Monday, saying PG&E is sorry and eager to […]

Judge stabbed and deputy shot in Washington courthouse

Grays Harbor County Courthouse

Following a standoff in a Washington state county courtroom Friday, a man reportedly escaped after shooting a sheriff’s deputy in the shoulder and stabbing a judge in the neck. The man is still at large. Treachery among the tree farms The incident occurred Friday afternoon in the western Washington town of Montesano, which bills itself […]

Microraptor was one flashy little dinosaur

Microraptor fossil

A team of Chinese and American scientists have found that Microraptor, a small four winged dinosaur that went extinct about 130 million years ago, was likely black and almost certainly had glossy, iridescent feathers. Until now, the coloring of extinct creatures was a matter of pure speculation. That may no longer be the case. The […]

Autocorrected message leads to school lockdown

Homage to the Sun

Adjacent schools in Georgia were locked down for two hours Wednesday after a text message reportedly warned of a “gunman” on campus. Later, it was learned that the message was the result of a smartphone autocorrect function, attempting to “fix” the misspelled slang word “gunna.” A series of mixups A series of mixups led to […]