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Do left-handed see different than right-handed people when looking at the same thing The following experiment will answer the above question The variables are as follows The dependent variables are the rightleft-handed people the independent variables are the optical illusions and the control is what the people see when they look at one of the optical illusions Background Research The brain functions through nerve cell circuits Communication between neurons is both electrical and chemical Chemicals called neurotransmitters carry signals from one neuron to another One neuron may communicate with thousands of other neurons and many thousands of neurons are involved in even the simplest behavior Each brain hemisphere is specialized and dominates the other in certain functions This dominance is related to whether a person is right-handed or left-handed In most right-handed people the left hemisphere processes arithmetic language and speech The right hemisphere interprets music complex imagery spatial relations and emotions In left-handed people the pattern of brain organization is more variable Handedness has a strong but not perfect correlation with the hemisphere of the cerebrum on the brain that is dominant for speech Approximately 97 percent of all right-handed adults are thought to be left-hemisphere dominant for speech Only 60 percent of the left-handed adults are right-hemisphere dominant for speech Moreover both left-handed and ambidextrous persons tend toward having speech representation in both cerebral hemispheres Although these correlations suggest a relation between cerebral dominance for speech and handedness their imperfect association particularly in nonright-handers leaves many questions concerning the relation unanswered Handedness is an organisms preferred use of one hand over the other Although other individual creatures show definite hand or paw preferences only in humans is the preference species wide Roughly 90 percent of all living humans are believed to be right-handed Since this has been so for a long time the trait may be inherited Another possibility however is that it is learned and culture-related The genetic theory is
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