While there are many theories as to why a person may be born left handed instead of right handed, there are no conclusive answers. It is thought, however, that left-handedness is genetic. While there are still missing pieces concerning the reason people are left handed, much is known about the differences in left-hand dominant individuals.
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Left Handedness and the Brain
The brain is wired so that its dominant side controls the opposite side of the body. People who are right-hand dominant are considered left brained, while individuals who are left-hand dominant are said to be right brained.
Decided from the Beginning
Hand dominance is decided within the womb. The hand that becomes dominant is normally the hand that the unborn baby holds closest to his or her mouth while they are in the womb.
In the case of twins, more often than not one twin is right handed and the other one is left handed. This opposite situation makes identical twins look more like mirror images of each other.
Dyslexia is more prominent in left-handed people than those that are right handed. This is especially true if the person is made to use their right hand instead of their left.
Puberty and Beyond
Left-handed individuals reach puberty around four to five months earlier than right-handed individuals. Individuals that are left-hand dominant tend to have shorter lifespans than those that are right-hand dominant.
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