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The University of Portsmouth Introduced A Study About Puppy Dog Eyes


Photo by Charles 🇵🇭 on Unsplash

A research team from Unversity of Portsmouth studied dogs facial expression and compared it with closet related species the wolves turn out the dogs developed a new muscle around the for better communicate with humans and let them care about it.


The research team studied the behavior and the facial anatomy of both dogs and wolves they found that the dogs evolved some changes over thousands of years when humans first met dogs the anatomy changes designed to make the communication with humans very obvious.


when the scientists first analyzed and compared the examination of facial anatomy of both dogs and wolves in addition to their behavior the scientists found a great similarity in facial musculature in both dogs and wolves except one small thing in dogs they have a small muscle in its face over the eyes its function is to let dogs raise the inner eyebrow, they didn't find this muscle in wolf's anatomy face.

The authors suggest that the inner eyebrow-raising movement triggers a nurturing response in humans as a result of it makes the dogs' eyes seem larger, more like babies and additionally resembles a movement humans produce once they are unhappy.

The research team included behavioral experts and anatomic researchers from the united kingdom and united state and the leader of the team was Dr. Juliane Kaminski who is an expert in comparative psychologist at the University of Portsmouth.

You can find the full research published in the journal Proceedings of the National Academy of Sciences (PNAS).

According to Dr. Kaminiski, the strong proof that the dogs developed the raising inner eyebrow when humans chose to domesticate dogs from wolves and start a relationship with them.


The behavior study showed that when human meet both wolf and dog and contact with them in about two minutes dogs start to rais the inner eyebrow higher than wolves and this experiment is very easy you can do it at your home with your own dog and tell us in comments.

You may wonder why human chose dogs over wolves, according to the research the expression on the dog's face especially the eyebrows expression it could result from an unconscious predilection that effected on humans in the selection process that time. when the dogs raise their eyebrows it makes feel a strong desire to take good care of them it feelings bond most of dogs people feel it. This would offer dogs, that move their eyebrows additional, a variety advantage over others and reinforce the 'puppy dog eyes' trait for future generations.

Dr. Kiminisky is interested in dogs behavior and tries to give us a clear vision, she proved in her research that the dogs raised their eyebrow around humans and more when someone looks at them while they act normally when no humans around and nobody looks to them in the eyes.

The raising eyebrow move called in the science community (AU101). Dr. Kiminsky said this move is important in human- dogs link because of the probability of eliciting care response from humans in another prospect it could create an illusion of human-like communication.

Professor Ann Burrows from Duquesne University who contribute as a co-author in this study and helped the team in better understanding of facial anatomy, she said that they compared the anatomy and behavior of both dogs and wolves to know if the AU101 results from the evolution, they discovered that the small muscle that allows dogs to raise their eyebrows was different in wolves, it was a limited and irregular cluster of fibers.

the scientists conclude that spacial muscle responsible for raising the inner eyebrow isn't constantly existed in wolf which is the closest living animal to dogs.

This may be a striking distinction for species separated only thirty-three thousand years ago and they suppose that the remarkably quick facial muscular changes are often directly connected to dogs' increased social interaction with humans.


Photo by Courtney Clayton on Unsplash. Wolf Mountain Sanctuary, Lucerne Valley, United States. Here’s a beautiful wolf I got to meet at Wolf Mountain Sanctuary. He was the sweetest.

Professor Bridget Waller the evolutionary psychologist from Portsmouth University corporated with Dr. Kaminski made a spacial map for facial muscular structure in dogs and they are first named of AU101 which is the action unit of raising inner eyebrow movement of raising.

The AU101 move makes dogs eyes look larger than usual and it gives them childlike appearance. It could also imitate the facial movement humans make when they're sad.



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