Walking onto the glass platform of Willis Tower, 412 metres from the streets of Chicago, is enough to make most people dizzy.
No such babies, they were born without fear of heights.
This caution now seems to be the result of crawling.
You may think that fear of heights is natural because falling from a height can lead to injury or death.
But babies without crawling experience are not afraid of height.
"Mothers almost generally report that if caregivers do not intervene, their children will go through a stage where they will cross the edge of the bed or table, joseph Campos of the University of California, Berkeley, said he was in charge of overseeing the study.
Then all of a sudden, after they learned to crawl for about six weeks, they seemed to get scared.
What triggered this dramatic shift?
In order to investigate, Auden Dahl, also in Berkeley, and his colleagues put babies who can't climb in yet --
They can control the trolley with a joystick.
After three weeks of training, the baby dropped to 1. 3 metre drop-off.
Baby's heart rate-
Carters add 5 times a minute, which shows they are anxious, not
The baby driving is the same.
The baby was also tested in the "move room"-a room where walls and ceilings are all moving to create the feeling of being projected forward. The go-
When the walls move, the moving baby moves back, while the other babies move much less.
Campos says this shows that pushing your own behavior in space teaches the brain to be aware of the information in the surrounding field of vision and use it to correct the balance.
In addition, the baby with the strongest response to the mobile room also has the biggest increase in heart rate when it dropsoff (
Crawling teaches the brain to be aware of the surrounding field of vision and to use it in separate experiments to correct the balance, and babies who have been able to crawl have been tested in a moving room, then placed near the edge of a large glass table.
One side is lined up and the other side is clear so the baby can see the floor.
Those who reacted most violently to moving the room were most likely to avoid getting through the transparent part of the table to the mother on the other side.
The finding may also explain why passengers looking out the window of the plane don't feel dizzy, while the same person sitting on a transparent "bubble cockpit" helicopter is reduced to clutter
When you look out from a flat window, the information in your peripheral vision is relatively fixed, while in the bubble cockpit, much more happens.
"Passengers see the world through a transparent bubble canopy and have to make a lot of tiny body adjustments and get a dazzling feel," Campos said . ".
"About the origin of fear of falling, the striking thing is its intimate connection with the self
"Sport," agreed Carlos Coelho of the University of Queensland, Australia.
He found that people with extreme dizziness will become anxious not only when they must go higher, but also when they must move horizontally at a fixed height (
Online Psychology and Behaviororg/bhgwjm).
"The fear of height also seems to be affected by the adult movement," he said . ".