Most of us are right-handed, a few are left-handed, and a small number is ambidextrous – that is, they can use both hands with equal ease.
What causes left-handedness? There are many theories. Some say it is inherited; others, that it is a result of habit, education, and environment. Most scientists, however, believe that left-handedness has a biological basis. It is known that the left hemisphere of the brain controls the right half of the body and the right hemisphere, the left. Most of us are right-handed because in most of us, it is the left hemisphere that is dominant. In those who are left-handed, it is the right hemisphere of the brain that is dominant. If there is no dominance of either hemisphere over the other, then the person might become ambidextrous.
American psychiatrist Camilla Benbow has found that many students who are exceptionally good at mathematics are left-handed. She says this is due to the dominance of the right hemisphere of the brain, which is the seat of mathematical reasoning ability.
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