Transcript Brain Hemispheresx

Brain Hemisphere and
Specialization
Brain Imaging
• CT or CAT (computerized
tomography) scan – computerenhanced x-ray of brain structure
• MRI (magnetic resonance imaging)
scan – uses magnetic fields & radio
waves to map brain structure –
better resolution than CT
Image courtesy of the
Yousef Mohammad, M.D.,
MSc; Assistant Professor
of Neurology Division of
Cerebrovascular Diseases,
The Ohio State University
Medical Center
http://faculty.washing
ton.edu/chudler/imag
e.html
– fMRI maps function
• PET (positron emission tomography)
scan – examines brain function,
mapping activity
Image courtesy of the
National Institute on Drug
Abuse
Brain Imaging
• EEG (electroencephalograph) –
records electrical activity of brain,
especially in sleep research
• MEG (magnetoencephalography) –
studies magnetic fields generated by
neural activity; used to research
activity/function
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The Split Brain
What would happen if your corpus
callossum was cut/severed?
Activity
• Draw a triangle with the right hand at the
same time you draw a circle with the left
– Demonstration on board.
– How would split brain patient do with this task?
Why?
• Corpus callossum is sharing information and making it
difficult for you
• Split consciousness: can’t really devote 100% of
conscious to more than one task
Which parts of the brain are active?
• Anne, the landscape artist, is standing at her easel, painting with her
right hand as she looks out the window at her garden. She’s
listening to classical music as she paints.
• Crazy Eddie, the professional wrestler, is in the ring wrestling. The
crowd is yelling and his opponent is taunting him. Eddie yells back at
his opponent. The two of them are out of breath and sweating
profusely. They continue their well-orchestrated series of wrestling
moves.
• Jill is a law student studying for the exam. She is reading about
violent rape and murder cases. She is snacking on popcorn and
drinking coffee.