Left Handed Theory

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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 handedness of a person will tend to indicate a particular part of the brain where it determines that a left handedness person has a language comprehension and production on its right hemisphere of the brain and vice versa (Broca, 1960). It means that handedness appears to be related in the right and left side of the brain. There are approximately 95% of right handed people that process their speech in the left hemisphere of the brain, while only 19% of left handed people process in the right hemisphere of the brain. This only tells that there are also some left-handed persons who process their speech in their left hemisphere of the brain just like the case of the right-handedness people (Broca, 1960). Generally, a small chance of left-handed will take advantage on this theory of brain…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

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