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Ch10- Language: The Brain & Language Disorders

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John Bassili

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LEC04 [Chapter 10]Language: The Brain & Language
The Role of the Brain in Speech
Hemispheric specialization
oRhyming task: Language is mostly localized in the left hemisphere. More for
men than woman (fMRI scan)
FMRI functional magnetic residence imaging, sophistic x-ray, but doesnt just see
bones, calsified tissue, but also sees soft tissue, tendons, muscles, cartiliage
oSees what happens when we think speak etc, what parts of the brain is active
oWhen we use areas of our brain, thinking, speaking, etc, active areas, there is
a deplection of oxygen in the blood to keep it fuction. Oxygenated blood is
needed to fuction, brain has a way to tell cardiovascular system to send blood
to that area of the brain. Systems sends more blooded than needed to the
area. Statisitical procedure, output says (FMRI) can tell that there is more
oxygenated blood in that area when it is active. Its a comparision from when
the brain is engaged in task, and when its not.
oResponse is called BOLD (Blood oxygenated levels dependence) what the
FMRI relies on
oNot only imaging technology ,
oPET (positron emition tomography) injecting isotopes as traces in the body
and a scanner that scans where the blood is going
oEach have their own strengths and weaknesses
oFmri methodiology of choice, spaceial resolution (precise picture) not good
with temperal resolution, seeing the time that it takes for things to travel and
show up.
oPET is good at temperal resolution than FMRI
oEEG is cheaper technology is very quick with temperal resolution
Localizing Language Centres
Language is localized on the left side of the brain
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