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Lecture

NEUR 2600 Lecture Notes - Angioma, Visual Cortex, Doreen Kimura

by

Department
Neuroscience
Course Code
NEUR 2600
Professor
Ian Whishaw

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Aneurysm
Stroke
Angioma
Tumors
Useful for removing damaged parts of the brain
Epilepsy
-
Didn't want to take out more than necessary when doing a removal
Pioneered human brain stimulation as a way of identifying parts of the brain to guide his
surgery
Brain stimulation
-
Inject isotope
1.
Positron released
2.
Positron collides with electron
3.
Two photons released in opposite directions
4.
Geiger counters locates their source
5.
Technique of mapping the function of the brain as a person engaged in an intellectual
task
The difference in blood flow in a resting condition and an active condition (more red)
reveals a part of the brain engaged in a functional task
Technique for measuring behavior
The subject can't run and jump, have to stay still
More blood flow during activity (released potassium which stimulates blood vessels,
blood vessels open
What if you read a complicated story? What lights up
Visual cortex lights up, supplementary cortex, all different parts are lighting up
beside Broca's area and Wernicke's
Reveals that a surprisingly large part of the brain is involved during language
PET -reveals that different parts of the brain are involved in different aspects of sound
analysis
Each of the tasks in the word-generation experiment activates a distinct set of
areas in the brain
Premotor cortex and temporal cortex are active with nouns for tools
Prefrontal cortex is active in a task requiring matching a noun to one of four target
words
Each one will be unique for a particular type of word
Switch quickly as someone speaks
Why? Neural net
These locations are active for different kinds of nouns
After early brain damage, speech can move to the right hemisphere.
The left hemisphere clearly has a preferred role in speech - but there are
exceptions:
Exceptions
Half of left handers have speech in the left hemisphere
A small number of right handers have speech in the left hemisphere
Different parts of sentences with different brain regions
Functions of the right hemisphere are like those of the right hemisphere except that
thye deal with musical sounds.
Wernicke area, right hemisphere
Singing to yourself, what happens?
Positron Emission Tomography
-
Wilder Penfield
Technology
March-15-13
10:57 AM
Brain and Behavior Page 1
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