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Tech & ScienceMotion sickness is proof that your body is functioning as evolution intended

17:41  11 september  2019
17:41  11 september  2019 Source:   popsci.com

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Motion sickness happens when there is a mismatch between what your eyes are telling your brain and what your inner ears sense as motion . This could be a coincidence, but it is more likely that it points to a deep connection that still exists between the human body and the ocean.

Motion sickness is your body 's response to the sensory disorientation caused by unfamiliar or extreme motion - anything from the swell of the Motion sickness is probably a problem as old as passive transportation. It’s generally accepted that a functioning vestibular system is a prerequisite.

Motion sickness is proof that your body is functioning as evolution intended © Provided by Bonnier Corporation Popular Science

Life started around 3.8 to 4.1 billion years ago.

For a large part of that time, organisms on Earth were simple and evolution was slow.

But something remarkable happened around 550 million years ago.

Increases in calcium and oxygen in the environment led to the development of the inner ears and balance organs (the vestibular system).

Another 165 million years after that, some organisms—including those that would evolve into human beings—were lured onto land, perhaps to get a better view.

Jumping forward to around 2,000 years ago, the Greek physician Hippocrates wrote that "sailing on the sea proves that motion disorders the body." Indeed, the word "nausea" is derived from the Greek "naus," relating to ships, sailing, or sailors.

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Motion sickness is your body 's response to the sensory disorientation caused by unfamiliar or extreme motion - anything from the swell of the Motion sickness is probably a problem as old as passive transportation. It’s generally accepted that a functioning vestibular system is a prerequisite.

Motion sickness is a common condition characterized by a feeling of unwellness brought on by certain kinds of movement. When motion sickness occurs, it likely results from a mismatch in signals about movement coming from different parts of the body .

About 65 percent of people suffer from motion sickness, women more often than men, with peak sensitivity around the age of 11. But why is it so common?

Normal response

Motion sickness happens when there is a mismatch between what your eyes are telling your brain and what your inner ears sense as motion.

In a car, this means that if you look down at a phone, a newspaper or a stationary object, your eyes are telling your brain that you're not moving. But your vestibular system (the organs of balance in your ear) is telling your brain that you are moving. This is the reason that having a good view of the road ahead and looking at the horizon prevents motion sickness: What your eyes see matches what your body senses. Experiencing motion sickness in a moving vehicle tells us that our vestibular system is working properly].

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Motion sickness is as old as recorded history, but there are simple ways to avoid and ease it. There are ways to prevent or treat it to keep your travels or trip to the amusement park a pleasant one. What Causes It? You get motion sickness when there are conflicts among your senses.

Motion sickness is proof that your body is functioning as evolution intended . If you have motion sickness , you're not alone in the animal kingdom.

Motion sickness is proof that your body is functioning as evolution intended © Spencer Salter Zebrafish have three semi-circular channels, lamprey have two, and hagfish have only one.

Humans aren't the only species to get motion sickness. Dogs, cats, mice, horses, fish, amphibians, and many other animals experience motion sickness, even if symptoms vary slightly between species.

If you look at these animals on a tree of life, they are all linked to the hagfish and lamprey as the lowest common ancestor. The hagfish has one vestibular channel, while the lamprey has two. Bony-jawed fish, such as sharks, came along shortly after the hagfish and lamprey. Like us, they have a three channelled vestibular system.

So have we inherited our sensitivity to motion from our fishy friends, becoming more susceptible to it as we became more complex over time? The answer is not that simple. Crabs, lobsters and crayfish all have highly developed vestibular and eye-control systems, which evolved independently and earlier than fish, some 630 million years ago. And there's anecdotal evidence that they, too, experience motion sickness. So seasickness is not simply an inherited quirk—it seems to be a sign of something working as it should.

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Motion sickness is also known as travel sickness , airsickness, carsickness or seasickness. Motion sickness does not usually occur when movement is under a person’s control. The information and materials contained on this website are not intended to constitute a comprehensive guide concerning

Motion sickness is proof that your body is functioning as evolution intended . Jumping forward to around 2,000 years ago, the Greek physician Hippocrates wrote that "sailing on the sea proves that motion disorders the body ."

But what triggers motion sickness in other species, and how could it be an evolutionary advantage? To answer this, we need to look at what kinds of motion exist in natural environments.

Beyond cars and boats

Oceans. Waves don't just exist above the surface, they are felt below the surface too, at levels between 0.16 and 0.2Hz, and affect sea life in several ways. Indeed, some fish have been shown to move out to calmer water during storms.

Seasickness could be the way a fish’s body lets it know it’s in danger. Interestingly, the amount of motion a human can withstand without getting sick is very close to that for a fish (0.2Hz), which also corresponds to the frequency of wind-generated waves. This could be a coincidence, but it is more likely that it points to a deep connection that still exists between the human body and the ocean.

Trees. Trees protect many animals, including our recent ancestor, the chimpanzee. But like the ocean, trees can be turbulent. It's possible that evolution favored the species that kept their aversion to motion, as they moved to lower, less mobile branches, so reducing their risk of falling to their death. Humans may think they've left trees and swaying branches behind, but the tall buildings we like to live and work in have a tendency to sway silently in the wind much as trees do, with some people sensitive to motion sickness reporting dizziness, loss of concentration, drowsiness, or nausea.

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Motion sickness arises when the vestibular systems of the inner ear send messages about body position or movement that are contradicted by the information sent by the eyes. Motion sickness is a self-limiting disorder, and prevention of the motion is the key to recovery in all cases.

Why is it that some people have sea-legs and will feel quite comfortable navigating their way Motion sickness is also known as kinetosis. The condition comes about as result of a disagreement between the movement you can see with your own eyes and the vestibular system’s sense of movement.

Our vestibular and other systems have evolved over millions of years for walking, so it’s not that surprising that boats, cars, camels, and, more recently, hyper-realistic VR head-mounted displays cause motion sickness. Our sensory systems have not had time to adapt to new technologies and environments.

Difficult to cure

Any solution to motion sickness is fundamentally at odds with millions of years of evolution, which is why it is so difficult to remedy.

Many take prescribed medication such as scopolamine to cure motion sickness, but as well as having unpleasant side effects, drugs prevent you from becoming used to the environment, meaning that you continue to rely on the pills. (Some people take herbal remedies, but these have mixed results.)

The most effective solution to motion sickness is to slowly get used to the environment. For example, someone who spends a lot of time on boats is less likely to get seasick, hence the phrase "sea-legs".

Motion sickness appears to be a normal response in all healthy humans. An ancient subconscious mechanism for genetic fitness has been perhaps mislabelled as a sickness. A motion “reflex” may be a better description.

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