Humankind has long accepted that each of us differs from all others in many respects, and is recognizable as an individual. We also have known that the motivating impulses, instincts, emotions, or reactions of each are different in degree and timing, even though the same number of these elements may always be present.
From these two basic observations, two other phenomena became evident: 1) that man is different one side to the other, both in measurement, impulses, instincts and reactions and, 2) each side reflects a parent in character.
What does this mean in the world of behavioral genetics? If physical characteristics are key indicators of our patterns of behavior, the more we differ from one side to the other, the more we differ in moods, instincts and impulses. These swings give us sparkle and add dimension to our life here on the planet. Our side-to-side differences give us our capriciousness and account for our complexes, emotional instabilities, the differences in our dexterity, our dispositions, aptitudes, health, poise, vocational potential and personality.
As you know, the body structure on one side of an imaginary median line below the eyes is controlled by the opposite brain hemisphere. The structure on one side reflects the paternal genetic pattern, while the other side reflects the maternal genetic pattern. When these two sides are quite different, the sensitivity and susceptibility to the bombardment of environment is noticeably different.
Every tailor and dressmaker knows that the right and left sides are generally dissimilar. Every oculist knows that when he fits a pair of glasses, the ear pieces need to be adjusted because one ear sits higher or lower, or forward or back, of the other.
Every where we look in nature we see this asymmetry. It is more the rule than the exception. No two brains or skulls are alike. Consider the emerging interest in biometrics as a form of security designed to enhance fingerprint identification.
If you put on make up or shave off your stubble, the evidence is right there in front of you. You know. You can see it. You are not an exact copy, left to right. Every single one of us differs from one side to the other...and, it means something.