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Word Count: 767
The Split Brain in Man The effects of a split-brain operation are most dramatic when sensory information is limited to a single hemisphere because when the corpus callosum is cut the brain is divided into two separate hemispheres the right and the left RSperry and MGazzaniga show the dramatic effects in various experiments conducted In one such experiment lights were flashed on the left visual field of a split-brain person the person reported that they had not seen any lights This is due to the right hemispheres disconnection with the speech centers of the brain which is located in the left hemisphere However the patient could point to the direction where the lights were flashed as pointing does not involve the speech portion of the brain Another example that shows the dramatic way sensory information is interpreted by a single hemisphere is when the word heart was flashed having the he to the left and the art to the right When the patient was asked what they had seen flashed on the screen they would answer art as the left hemisphere is responsible for speech However when asked to point to a card having the word art or he on it the patient would point with their right hand to he therefore showing that when the right hemisphere could express itself it would From the examples above it is clearly seen that with split-brain patients when doing normal tasks using both sides they can continue fine but when the tasks are specific to one side of the brain they lack the information needed from both sides The effects of sectioning the optic chiasm causes the information from the left eye to be dispatched to the left-brain and the information from the right eye only being dispatched to the right brain When the optic chiasm is cut an animal could respond normally and learn to perform a task when that eye
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