Just look at their owners, dogs can elicit a response in the brains of those who helps them interact, says a study. And the owners of the animals they can cause the same in reverse, the researchers said.
This linkage of double track evidently began when dogs were domesticated in the distant past that helped connect to both species, They pointed Japanese researchers.
The experts in dog psychology Evan MacLean and Brian Hare, Duke University, wrote in a comment to report that “when your dog is watching, could not be precisely craving your sandwich “.
The new study is the first to present a biological mechanism for interaction between species, said researcher Larry Young of Emory University.
Neither he nor scientists Duke were involved in the Japanese study published by the journal Science on Thursday.
The brain’s response is an increase in levels of a hormone called oxytocin. Studies in humans and in animals indicate that this substance promotes social bonding, as between parent and child or between lovers.
An experiment in new research involved 30 owners and their dogs. Oxytocin samples were taken in the urine of both species before and after masters and dogs spent together half an hour.
The analyzes indicated that owners whose dogs looked longer at the first five minutes were up to them more oxytocin levels. Also, dogs that looked more time also had a hormonal impulse. That is evident when touched by the owners during the session, said in a message via email one of the authors, Takefumi Kikusi, the Azabu University near Tokyo.
No results were repeated in an experiment with wolves. These were reunited with people who had grown up, but not as pets. The difference suggests that the dogs began to look to its owners as a social strategy to be domesticated instead of inheriting from their wolfish background, the researchers speculated.
Another experiment found that dogs looked longer at their masters if they were given doses of oxytocin, and hormone levels rose after the masters. But these results are only given to dogs and not dogs, but the difference is understood
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In the network.
Science: http://www.sciencemag.org
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