Theory Of Left Handedness

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Many psychologists, professors and other researchers have studied the mechanism and explanation of having a left-handed trait among a few individuals. The brain hemisphere division of labor is the most accepted theory about the left-handedness of a person. (Broca, 1960) proposed that the handedness of a person can be associated by the brain hemisphere division of labor. The brain is divided into two hemispheres which are the right and left hemisphere. Each of the hemispheres has their different functions in our body. The right hemisphere of the brain is its creative side. The functions of right hemisphere of the brain are more on the visual and include some abilities such as face recognition and visual imagery. However, the left hemisphere…show more content…
The gens that can be determine are the gene D which means dextral and gene C for chance. A theory called Dextral and Chance theory was proposed to prove the genes that can determine the handedness of a person. The gene D is associated by the right hand which can control the speech process in the left hemisphere of the brain as stated in the brain hemisphere division of labor. The gene C is concluded as neutral. In the genotype DD, it will produce strongly right-handed offsprings, the heterozygous DC will produce a 25% of left-handed and 75% of right-handed, while the CC will produce a mixture of 50% left-handed and 50% right-handed individuals (McManus, 1992). Based on the statistics given, the right handedness is most dominant and likely to appear to other people. This theory only proposes that the minority of the individuals has a gene C which gives the trait of…show more content…
It was stated that the brain hemisphere can be associated with the handedness of a person where the right hemisphere of the brain controls the left side of the body. Therefore, pathological theories conclude that the left-handed people are just brain-damage right handed individuals. With this theory, it was assumed that the right-handedness is basically the natural trait of a person and due to some stressors and physical trauma, the effect will be the left-handedness. During pregnancy, if the child’s right side of the brain which controls the left side of the body gets damage, then the right-handedness of the child will remain. However, if the left side of the brain gets damage, the brain’s plasticity will transfer the movement in the right hemisphere of the brain which can causes the left-handedness of the
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