Dogs, more so than almost any other domesticated species, are desperate for human eye contact. When raised around people, they begin fighting for our attention when they’re as young as four weeks old. It’s hard for most people to resist a petulant flash of puppy-dog eyes—and according to a new study, that pull on the heartstrings might be exactly why dogs can give us those looks at all.
A paper published today in the Proceedings of the National Academy of Sciences found that dogs’ faces are structured for complex expression in a way that wolves’ aren’t, thanks to a special pair of muscles framing their eyes. These muscles are responsible for that “adopt me” look that dogs can pull by raising their inner eyebrows. It’s the first biological evidence scientists have found that domesticated dogs might have evolved a specialized ability used expressly to communicate better with humans.
By evolutionary standards, the time since this split has been remarkably short for two new facial muscles to have developed. For a species to change that quickly, a pretty powerful force must be acting on it. And that’s where humans come in. We connect profoundly with animals capable of exaggerating the size and width of their eyes, which makes them look like our own human babies and “hijacks” our nurturing instincts. Research has already demonstrated that humans prefer pets with more infantlike facial features, and two years ago, the authors of this latest study showed that dogs who made the facial movement enabled by the RAOL and LAOM muscles—an expression we read as distinctly humanlike—were more likely to be selected for adoption from a shelter than those who didn’t. We might not have bred dogs for this trait knowingly, but they gained so much from having it that it became a widespread facial feature. “These muscles evolved during domestication, but almost certainly due to an advantage they gave dogs during interactions with humans that we humans have been all but unaware of,” Hare explained.
|Dogs have evolved for better interaction with humans||584||Nolondil||17-Jun-19 23:01|
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