Table of contents:
- Babies can move their hands since in the womb
- Genetic and environmental factors influence a person's tendency to be left-handed
- So left-handed people have many advantages
- Be more creative
- Left-handed people tend to be intelligent
- Can use two hands
Ten percent of the total 7.6 billion people in the world are left-handed people. Left-handed people not only use their left hand to write, eat, comb their hair, until they pick their nose, but also chew on the left side of the mouth and go ahead with the left foot. What, the hell, causes left-handed people?
Babies can move their hands since in the womb
Quoted from Medical Daily, the tendency to wear more on one side of the hand has been formed since in the womb - precisely at the 8th week of pregnancy. Meanwhile, the habit of picking your thumb with one side of the hand appeared at week 13 based on an ultrasound examination.
A joint research team from the Netherlands, England, and China found that the reason a person can be left-handed comes from the nerves in the spinal cord. This finding refutes old theories that the brain is the main determinant.
Initially, many researchers thought it was the brain's motor cortex that sent signals to the spinal cord to move the hands and feet. But the study reports that the motor cortex isn't even connected to the spinal cord at 8 weeks' gestation. In fact, babies can already move their hands in the direction they prefer at that age. In other words, babies can start movements and choose their favorite hand before the brain starts controlling their body movements.
Genetic and environmental factors influence a person's tendency to be left-handed
Researchers from Ruhr University Bochum, Germany, looked at DNA sequences in the baby's spinal cord at weeks 8 to 12 of pregnancy. They found that the DNA sequences in the nerve segments that control the movements of the feet and hands on the right and left of the bone marrow differ considerably.
"This is not impossible because many nerve fibers cross from one side to the other at the boundary between the hindbrain and spinal cord," explained Carolien de Kovel, lead author of the study and researcher at the Max Plank Institute for Psycholinguistics. Researchers concluded that this difference could be influenced by the environment, which in turn would affect the baby's growth and development.
Simply put, the development of left-handed hands has occurred since in the womb. Genetic factors and environmental exposure during pregnancy both play a role in making a person left-handed, concluded de Kovel.
So left-handed people have many advantages
Even though it is a "rare population", you who are left-handed do not be discouraged. Prince William, Bill Gates, Oprah Winfrey, Barack Obama, Kurt Cobain, and Maradona are world famous left-handed figures.
Research reveals several features of being left-handed, including:
Be more creative
According to research in the Journal of Mental and Nervous Disease, musicians, painters, and writers are mostly left-handed. Michael Corballis, PhD, a brain specialist and a psychologist at the University of Auckland in New Zealand points to the fact that left-handed people tend to think creatively to solve problems
Left-handed people tend to be intelligent
According to a study from St. Petersburg Lawrence University, America, left-handed people tend to be smart. Many left-handed people have IQs over 140 such as Da Vinci, Michelangelo, Einstein, and Newton. In addition, left-handed people usually prefer to observe and have good language skills.
Can use two hands
The multitude of household utensils and activities aimed at right-handed people ultimately "force" the left-handed person to go with the flow and exercise his right hand. As a result, it is not uncommon for left-handed people who are finally able to use both hands equally well. These people are referred to as ambidexterous, and their population is even rarer worldwide.
