Long Term Consequences Of Switching Handedness

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In their research article, “Long Term Consequences of Switching Handedness: A Positron Emission Tomography on Handwriting in “Converted” Left Handers, “ Hartwig R. Siebner and colleagues hypothesize that the functional neuroanatomy of the those made to write with their right hand, converted left handers, and natural right handers would differ. Moreover, Siebner and colleagues proposed that converted left handers brains’ would show sustained features of covert left handedness—throwing a ball left handed or carrying bags with the left arm—and that higher order aspects of manual motor control would be functional asymmetrical between both hemispheres. Usually the functional neuroanatomy of an innate right hander is shown to be more active in the left hemisphere. The opposite is true for an innate left hander that is not converted. There has been a correlation made between writing, memory, and learning. If the functional neuroanatomy of the converted left handers differs from the usual functional neuroanatomy of the natural right and left handers, would it change higher order processes, memory and learning, of the brain? THESIS? Siebner and colleagues’ research experiment focused on the difference in the functional neuroanatomy between converted left handers and innate right handers using Positron Emission Tomography (PET) to track and study the changes in brain activity by measuring the changes in regional cerebral blood flow in the subjects. In the experiment there where three groups tested—the converted left handers, the innate right handers, and the control group of non-converted left handers—in two conditions, at rest and actively handwriting. In choosing the subjects the experimenters made sure that there was not a history of a... ... middle of paper ... ...nnate right handers by the added activation of the right hemisphere during right handwriting, there should be a change in the higher order processes—memory and learning—during the writing process. According to Klöppel and his colleagues’ study over whether switching to left handedness would reorganize the “cortical motor representations,” higher order processes of the dominant hand cannot be reorganized or transferred over the other hemisphere by training. However, the higher order aspects are strengthened by attempting to switch handedness for writing. Converted left handers are educational trained to write with their right hand, so the persistence of right handwriting while ignoring the left hand movements strengthens the higher order aspects of the right hemisphere. Therefore, motor attention is increased which could lead to better results in learning and memory.

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