Split Brain Hemispheric laterilzation Right brain and left brain Split brain research o Epilepsy patients o Corpus callosum o General experiment o Results o Understanding the results Intact brain research Some popular issues Localization of function Independent functional units Important question is How are they connected Hemispheric Laterilzation Functional specialization clear cut evidence in the study that areas of the brain are specialized certain areas have individual specific functions Corpus callosum connects the right and left side of the brain o Would sever the corpus callosum in severe eppilectic patients to help with problem This would cut off communication between left and ride side of the brain o In a normal person information on the right first comes through the left hemisphere and information in the left first comes through the right hemisphere When doing the experiment of putting shapes into boxes they fit people were faster with their left hand patient were also not allowed to see hands in experiment This indicated that special pattern location is functionally located in the right side of the brain When a normal person is to grab an object with their left hand it enters through the right but quickly transmits to the left side so the person understands If a corpus callosum patient grabs something with his left hand it is much more difficult for him to understand what he is grabbing he knows what it is but he cant name it Intact brain research This is done in the dark if in the light when seen patient or person can easily identify Each eyeball has a left and right visual field the left visual field enters through the right hemisphere the right visual field enters through the left hemisphere o Some of the functions involved in naming objects is located in the left hemisphere Perceptual assymetries intact brain people are slightly quicker to repspond when information is routed to the side of the brain where the localization takes place Neural tissue operates much faster than we do with the environment In the intact brain individual it is very difficult to keep information in only one side of the brain o If you can see it or hear it its getting into both hemispheres o Only way this could not happen is if only one side of body was involved and you could not see or hear what is happening Transmission across each hemisphere is extremely fast o This makes the idea of left brain and right brain people irrelevant Idea is that certain people use certain sides of brain Almost all right handed people show naming in the right hemisphere and spatial pattern recognition in the left hemisphere 70 of left handed naming in the right hemisphere Spatial pattern recognition in the left hemisphere 15 of the remaining 30 show the opposite and the other 15 show no position Localization of Function Neuropychology Introduction The neuron The Neuron the information processors Information flow in the neuron is one directional They take in information through the dendrites travels through the nucleus and across the axon Input through dendrites Output though terminal button o when neuron takes in information each input will gather information from thousands of other neurons this input either excites the neuron increasing level of activation or inhibits the neuron decreasing the neuron is graded in a fluctuating matter it integrated all of the information and doesn t do anything unless a particular threshold level is reached once it reaches the necessary level it fires major difference input works on threshold and fires at different grades of fluctuation sometimes more intense output is all or nothing meaning it either fires or doesn t and always fires at the same intensity Output aka neuron firing when a neuron fires an electrical impulse travels through the axon
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