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PSYB65H3 (519)
Lecture 9

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John Campbell

Lecture 9  Right brain and left brain different functioning  Observations during periods of war—wounds to the head, noticed patients responded differently if the wound was on the left or right  Damage to left hemisphere in ADULTS o 100% patients show some aphasia symptoms(problems in language) o approx 30% show recovery – these are left handed/ambidextrous o least amount of recovery in right handed individuals o right handed individuals had most problem with left hemisphere damage because language is in the left hand side, and no recovery o left handed/ambidextrous and lose language  can still recover and relearn  Damage to right hemisphere in ADULTS o Most patients shows few aphasic problems, rarely leads to full aphasia o Those who do show aphasic problems  left handed/ambidextrous o Right handed individuals only time they have a problem is damage in left hemisphere o Very good recovery from damage, suggesting left handed people have language on both sides  Hemisphere damage in Children (under 5) o Damage to either hemisphere has equal probability of effecting language (aphasic symptoms) o Suggests that language on both sides for children , childs brain is not yet fully lateralized  lateralization happens more in right handed individuals o Recovery: 100% children with brain damage show recovery  Acollossul (people born without corpus collusom) o Children with early extensive brain damage – language will always be on the opposite side, as we mature it becomes more localized to the left o Right handers: Left hemisphere better at language hemisphere o Language doesn’t shift over if you don’t have corpus collosum because there is no connection o Left handed people don’t show this lateralization  left handed individuals small brain damage? Genetic? o Why is the left hemisphere better at language?  plantum temporali – primary language area in temporal lobe larger and more convoluted, heavier than the one in right
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