why do i yawn when i read
According to a study published today in the journal Current Biology, if you want to stop someone from yawning, telling them not to be allowed is particularly effective. Researchers seek to better understand why so many of us yawn in response to others doing so, a phenomenon known as contagious yawning. Humans are not the only animals involved in this outlandish practice. Monkeys, chimpanzees, and even dogs will often yawn if they see – or even hear – someone else doing it. In one awesome meta test, study participants were recorded watching a video of people yawning, to see how often they yawn. Participants were shown the video in alternating blocks, where they were asked to yawn whenever the urge occurred or instructed to avoid it at all costs. Stephen Jackson, a neuropsychologist at the University of Nottingham, the team found that people should be able to control themselves — at least to some degree. But being told not to yawn did not actually make the subjects yawn less often. The guidelines have changed people’s perception of the need to yawn and the way it is expressed — people told not to yawn tend to hold them back. But the total number of yawns remained unchanged. This suggests that potentially infectious yawns are not entirely within our control. To understand why this variation exists, the researchers had the patients watch the yawning video again, with the same division instructions. But this time they attached each subject to a Transcranial Magnetic Stimulation (TMS) device, a machine that uses magnetic waves to measure what is known as the motor cortex’s ability to stimulate.Stephen Jackson using switching magnetic stimulation. The University of Nottingham’s cortical excitability is a measure of how easily neurons — how quickly cells send signals through the brain — motivate us to take actions such as: yawn. Some people have highly excitable brains: If the brain is playing baseball, they’re already at the third facility ready to run home. Others, with less excitable brains, rested comfortably in the dugout until they were told it was time to begin. It takes a lot of energy to get them around the diamond and back home. It turns out that people with more excitable motor cortex tend to yawn more often. It’s clear why we have the contagion impulse in the first place. But Jackson says its impact goes beyond learning not to yawn when you’re in a boring meeting. That’s because evidence suggests that the same part of the brain responsible for our involuntary yawning is also involved in some nervous system disorders like Tourette’s disease, where people make involuntary movements. , repetitive or unintentional sounds are collectively known as tics. “There are a lot of similarities between Jackson for what happens in Tourette syndrome and contagious yawning. “Many people with Tourette’s will say they find themselves ticking without any kind of awareness, and that’s similar to what we see when we yawn. Some people find themselves yawning without knowing that they are about to do so. In addition, ticks in people with Tourette syndrome are also contagious. So when you see multiple people with Tourette syndrome together, they often report that they tickle each other. They find themselves copying other people’s ticks without their knowledge. In the long run, Jackson thinks, a better understanding of why we yawn — and how these electrical signals lead to involuntary behavior — could help us develop new treatments to deals with disorders such as Tourette’s disease, Attention Deficit Disorder and Hyperactivity Disorder, and possibly even schizophrenia.Read more: why wine bottles creak | Top Q&A
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