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Lecture 9

Lecture 9 - Cerebral dominance and the neuropsychology of language

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University of Toronto Scarborough
Ted Petit

Lecture 9 Chapter 4 and 15 (Laterality and Neuropsychological Assessment) Cerebral dominance and the neuropsychology of language Brain lateralization: the functions of the left and right hemispheres of the brain arent the same. Left involved in language. What do the right and left brains do? And why is it that we have different functions on either side? History: brain damage resulting from wars was recorded Brain damage was different in different patients why was this so? This was all only looked at in adults (no kids at war) First real grasp of brain lateralization came from here What they found was whenever the brain damage was in the LEFT HEMISPHERE, when they studied these recovering patients 100% of the time showed some APHASIC symptoms speech deficits Aphasia: approximately 30% of these patients show some degree of recovery; 13 rd showed recovery (some didnt show recovery at all) and they were either left handed or ambidextrous that showed recovery Astute connection made that they were all left handed Noticed a correlation between people left-handedambidextrous people that would recover the only ones that could recover We group ambidextrous people with left-handed people for the most part and they are studied together basically ambidextrous people were genuine lefties that were forced to use their right Least amount of recovery was in right-handed individuals left hemisphere damage = right hemisphere unable to recover Since 100% of patients with damage to the left hemisphere showed some type of deficit in speech aphasia it was distinguished that the LH of the brain is responsible for language
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