If you write with your left hand, chopsticks in your left hand, ball in your left hand... All habits start with the left hand, so today is your holiday.
Many left-handed people are extremely inconvenient when using some tools, because most of the tools are designed for right-handed people at the beginning, such as:
Writing = challenging wrist dexterity
Every time you enter the subway station to swipe the card, after a "drip", the gate next to it opens
Some merchants have introduced a left-handed keyboard for left-handed people
Left-handers who serve soup with such a spoon have to make enchanting moves on the spot
Peeling knives are also too dangerous
Left-handed people canned it up to a higher chance of injury than right-handers
Left-handed driving is said to be brain-burning
For a long time, questions such as "are left-handers smarter" and "do left-handers need to be corrected" have often been discussed. August 13 is The International Left-Handed Day, Life Times (search for "LT0385" in WeChat to follow) combines a number of research interviews with experts to take you to understand the world of left-handedness.
Experts interviewed
Xi Yingjun, director of the Psychological Crisis Intervention and Stress Management Center of Beijing Anding Hospital
Guo Chufang, director of the psychotherapy ward of Beijing Huilongguan Hospital
Left-handedness can be judged in the womb
According to statistics, left-handed people make up 10% of the world's total population, that is, on average, 1 in 10 people are left-handed.
In the past, it was often thought that it was only when the child ate by himself in early childhood and drew by hand that he could tell whether the child was left-handed.
In fact, left-handed people have already decided in the womb.
Institutions such as the Italian Higher International Graduate School and the University of Padua jointly conducted a study.
The researchers observed ultrasound images of the real-time movement of the fetus in 20 minutes at 14, 18 and 22 weeks of the fetus.
After 9 years, the consistency rate reached more than 89% compared with the movement habits of these children when they grew up.
Researchers have found that from week 18 onwards, fetuses begin to use more of their grown "dominant hands" to perform movements that require greater precision.
At the moment we can be sure that left-handedness is not a disease and does not need to be corrected. But pressure from family, society and other aspects has made many left-handers learn to "open the bow left and right".
Experts say that many public facilities, rules and tools are designed according to the habits of right-handed people, which makes left-handers appear clumsy from an early age and even appear depressed.
It has been scientifically proven that forcibly correcting left-handers can cause irreversible damage to the brain, and many people will have symptoms such as stuttering, dyslexia or ADHD after being corrected.
Recommendation: A child's intelligence has innate factors, but acquired development and cultivation are more important. If your child is left-handed, don't force them to correct.
Left-handedness is rich in genius?
At the just-concluded Tokyo Olympics, there were many left-handed athletes who shined, such as Sun Yiwen, Xu Xin, Li Yingying, Jia Yifan, etc. When you think of the "golden left hand" of sports, who comes to mind first?
From left to right: Sun Yiwen, Xu Xin, Li Yingying, Jia Yifan
Tennis players McEnroe and Nadal are left-handed.
American professional tennis player John McEnroe
Spanish professional tennis player Rafael Nadal
It is said that many scientists are also left-handed, such as the well-known Marie Curie and Newton.
Left: Marie Curie, Right: Isaac Newton
Are left-handers really smarter than the average person? In fact, scientific studies have shown no significant difference in IQ between left-handed and right-handed people. Although there is a division of labor between the left and right brains in the brain, the two are not opposites, whether it is language or reasoning, it needs the cooperation of the left and right brains. In fact, the world is more of a right-handed celebrity, but the label of right-handed is easy to be ignored by everyone's inertia.
The left brain is the "rational hemisphere" that is in charge of logical thinking, and the right brain is the "artistic hemisphere" that is in charge of image thinking. As a result, left-handed people tend to have the following advantages:
1 Has a strong spatial imagination. Before writing or drawing, the image in your mind has been formed.
2 Strong sense of direction. Left-handed people can intuitively grasp the direction.
3 In sports, left-handed people react relatively quickly and the body is more flexible.
4 Have a talent for painting. Since childhood, his ability to doodle and draw pictures has been very high.
5 Have better ability to adapt to pressure. High emotional intelligence.
Oxford University: Left-handed Parkinson's is less risky
A research team at the University of Oxford in the United Kingdom, after analyzing the genomic information and handibility of nearly 400,000 volunteers, and the detailed brain imaging of 9,000 of them, found that some of the chiral genes and mental illness genes also overlapped.
The analysis showed that the left-handed gene was positively associated with schizophrenia and negatively associated with Parkinson's disease.
That is, people with "left-handed" genes have a slightly higher risk of developing schizophrenia, but are less likely to develop Parkinson's disease than those who are accustomed to right-handedness.
Compared with the straight-line thinking of right-handed people, left-handed people are more adept at comprehensive thinking, and everyone can usually exercise the ability to open bows left and right and develop in a balanced manner.
To find the most comfortable writing posture for left-handed writing, sit on the right side of the table, let the upper right corner of the paper be higher than the upper left corner, and the lamp and stationery are placed on the right side.
When using the mouse, you can set the "mouse" item in the "control panel" of the computer to switch the primary and secondary buttons, so that the left and right mouse button functions are changed and more convenient to use.
Usually, you can consciously use your right hand to brush your teeth, do housework, and exercise the flexibility of your right hand.
Use your right hand to hold things, use some simple tools, pick up the ball for training, and practice the functions of your right hand.
Test whether you have left-handed genes
Japanese scientists have compiled a standard for defining left-handedness, and compared the following test content to see if you have left-handed "genes".
Left-handed gene quiz
In the 10 basic habits of writing, taking chopsticks, throwing things, brushing teeth, using scissors, wiping matches, threading needles and threads, using tools such as hammers, holding rackets, and washing your face with a towel:
If it's all left-handed, it's definitely left-handed.
If the first 6 items use the left hand, the last 4 items can be defined as left-handed even if all of them use the right hand.
If 1 to 5 of the first 6 items use the right hand, then there is no fixed bias in the person's two hands.
Interested friends may wish to use this method to do a small test to see if they are left-handed, or a potential "invisible left-hander" who has been corrected since childhood. ▲
Editor of this issue: Wang Weixin
Copyright notice: This article is the original of Life Times, and unauthorized reproduction is refused.