Language: The Brain & Language Disorders

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University of Toronto Scarborough
John Bassili

LEC04 [Chapter 10] Language: The Brain & Language Disorders The Role of the Brain in Speech Hemispheric specialization o Rhyming 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 o Sees what happens when we think speak etc, what parts of the brain is active o When 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. o Response is called BOLD (Blood oxygenated levels dependence) what the FMRI relies on o Not only imaging technology , o PET (positron emition tomography) injecting isotopes as traces in the body and a scanner that scans where the blood is going o Each have their own strengths and weaknesses o Fmri 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. o PET is good at temperal resolution than FMRI o EEG 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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