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Brain Lat.

3 Pages
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Department
Psychology
Course Code
PSYB65H3
Professor
Ted Petit

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Brain Lateralization: Chapter 4 Lecture 9
-refers to the fact that brain function does not happen bilaterally, different structures serve
different purposes
Historical Perspectives:
- began in testing of WII brain injuries, each patient exhibited different speech
impairments
Brain damage observed in left hemisphere:
-100% showed some form of aphasia (problems in language)
-30% showed some recovery in varying degrees, it was found that most left/ambidextrous
peopled recovered
-the least amount of recovery was reported in right handed people
Brain damage observed in right hemisphere:
-very few language problems and rarely lead to language problems
-those who did show aphasia were left/ambidextrous
-it was concluded that because right hemisphere damage did not result in language
problems and right handed people also did not show symptoms, language is attributed to
left hemisphere functioning
-in left handed people, language is bilateral, both hemispheres deal with language
-If damage is done to the RH and you are RIGHT handed then NO aphasia
-but if damage is done to LH and you are RIGHT handed then aphasia
-if LEFT handed, damage in either LH or RH can effect language but the other H not
damage can compensate
Children (below age 5) and Brain Damage
-at this age language is still bilateral. Therefore any damage to either lobe can effect
language.
-100% of patient s will show recovery, this is because the other NOT damaged H will
compensate
-at this age the brain is very plastic and some will have damage H removed (because
scarred tissue can result in seizure late on in life)
-during development brain becomes lateralized
Acolosual patients (born without corpus collusom)
-those with no CC have language on both side
-therefore it seems that during development in ‘normal’ person both H are capable of
language acquisition but LH seems to suppress RH and become dominant and more
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Description
Brain Lateralization: Chapter 4 Lecture 9 -refers to the fact that brain function does not happen bilaterally, different structures serve different purposes Historical Perspectives: - began in testing of WII brain injuries, each patient exhibited different speech impairments Brain damage observed in left hemisphere: -100% showed some form of aphasia (problems in language) -30% showed some recovery in varying degrees, it was found that most leftambidextrous peopled recovered -the least amount of recovery was reported in right handed people Brain damage observed in right hemisphere: -very few language problems and rarely lead to language problems -those who did show aphasia were leftambidextrous -it was concluded that because right hemisphere damage did not result in language problems and right handed people also did not show symptoms, language is attributed to left hemisphere functioning -in left handed people, language is bilateral, both hemispheres deal with la
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