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People suffering from a rare brain disorder, when they look at someone, they see distortions to the same half of a person’s face, regardless of how the face is viewed. Researchers have now decoded why this happen.
People who have a rare condition known as hemi-prosopometamophosia (hemi-PMO) makes it discomforting for them to look at faces.
According to a new study published in Current Biology, the results demonstrated that our visual system standardised all the faces we perceive using the same process so they can be better compared to faces we have seen before, like a face recognition system.
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“Every time we see a face, the brain adjusts our representation of that face so its size, viewpoint, and orientation is matched to faces stored in memory, just like computer face recognition systems such as those used by Facebook and Google,” explains study co-author Brad Duchaine, a professor of psychological and brain sciences at Dartmouth College in the US.
Hemi-PMO is a rare disorder that may occur after brain damage.
When a person with this condition looks at a face, facial features on one side of the face appear distorted.
The existence of hemi-PMO suggests the two halves of the face are processed separately.
The current study focused on a right-handed man in his early sixties with hemi-PMO whose symptoms have persisted for years.
He looked in the mirror at his own face and noticed that the right side of his reflection was also distorted.
The study involved two experiments. In the first, the patient was presented with images of human faces and non-face images such as objects, houses and cars, and asked to report on distortions.
For 17 of the 20 faces, he saw distortions.
The distortions were always on the right side of the face and facial features usually appeared to drooped.
For the second part of the study, the patient reported on distortions that he saw in 15 different faces that were presented in a variety of ways: in the left and right visual field, at different in-depth rotations, and at four picture plane rotations.
Regardless of how the faces were presented, the patient continued to report that the distortions affected the same facial features.
“The results demonstrate that our visual system standardizes all the faces we perceive using the same process so they can be better compared to faces we have seen before,” the authors wrote.(IANS)
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Federer, who made a late decision to attend this year's Laver Cup in Boston -- a tournament held between teams from Europe and the rest of the world -- said on the sidelines of the event that the recovery and rehabilitation are "going to take me a few more months and then we'll see how things are at some point next year". "The reception I've received, everybody is so upbeat that I'm here. They wish me all the best and they don't even see the crutches. They just want me to be good again and enjoy the weekend," Federer said in an interview for the event with former world No. 1 Jim Courier.
"I've seen some incredible tennis, some great matches and it's been wonderful. I'm really happy I made the trip," the winner of 20 majors was quoted as saying by atptour.com. On why he opted for a third surgery, the tennis ace said, "I was just nowhere near where I wanted to be to play at the top, top level. But I tried my best and at the end... too much is too much. Now I've just got to take it step by step," Federer said.
Federer received thunderous ovations inside Boston's TD Garden, where he has often been sitting in the front row watching the action or behind the scenes visiting with the players. The former world No. 1 has played in the first three editions of the Laver Cup. "I think Boston is a great city. The stadium is wonderful, the crowds have been incredible. Both teams are stacked with absolute quality and top players," Federer said. "That's what the idea was behind it: that everybody could come together, have the most incredible weekend, learn from one another and then hopefully that's going to inspire them, motivate them and get them going for the rest of this year, next year." (IANS/ MBI)
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