Class Notes (835,108)
Canada (508,934)
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PSYB65H3 (519)
Ted Petit (310)
Lecture 9

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Ted Petit

Lecture 9 HISTORICAL OVERVIEW early awareness came from observations during periods of war  IN ADULTS (over 20) o Left Hemisphere wounds  100% of patients shows some aphasic symptoms (problems in speech and language)  Approximately 30% showed recover either left-handed or ambidextrous (both hands  Right handed people had more problems with left hemisphere damage didn’t recover  If you are left handed you can lose language but gain it back right hemisphere is also capable of language in left handed o Right hemisphere wounds  Most patients showed few aphasic symptoms, few language problems and rarely leads to complete aphasia  Those who did language problems were always either left handed or ambidextrous  Right handed people did not have language problems  So for right handed people, language problem was an issue only if they had lesions in left  If you are left handed, you lose language either way but it is not that severe  Recovery: they show very good recovery suggesting left-handed people have higher recover rates.  IN CHILDREN (under 5) o Damage to either hemisphere has an equal probability of producing aphasic symptoms o Therefore there was some language on both sides in little children, unlike an adult. o When you look at recovery, 100% of children who suffer brain damage show recovery o Therefore the developing brain is not yet fully lateralized. o Somewhere around the age of 5 or so, the brain starts becoming more lateralized. o Lateralization occurs typically in right handed individuals and less in left handed o Because there is less lateralization and its plasticity, if you remove half of the brain of a child, they can still recover, not perfect but recover. o Almost always on opposite side of the brain of the damage o For some reason, the left hemisphere is better at language an suppresses the right hemisphere, as they grow up. o  ACALLOSSOL: born without a corpus callosum o In adults, they have language in both sides and even as left handed o Because the left and right cannot communicate, the left cannot suppress the right hemisphere, it continues with language; only loses language if it has a connection with the left hemisphere. ANATOMICAL RESEARCH What makes left hemisphere superior  Planum temporale  primary language area in the temporal lobe  In the left hemisphere, the planum temporale is larger and more convoluted and heavier than the exact same area in the right 1/3 larger left hemisphere is superior  What came first? Is it the cause or the effect  They looked at other greater apes and found that it was also found that the planum temporale was larger  suggests there is a genetic component  Newborns and left handed the planum temporale is still larger, without the experience so basically it is the cause and not the effect.  If you are right handed then language is almost always in the left hemisphere and for left handed, it is bilaterally.  Result of an experiment o In right-handed individuals, info presented to the left hemisphere (has language) is faster and the person responds more quickly if the info is presented to the verbal hemisphere o It longer longer when it was presented to the non verbal hemisphere right hemisphere in right handed people  longer than the time i
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