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Lecture 2

PSYB65-Lecture 2 Notes

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Ted Petit

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Lecture 2
x As move forward in brain, more complex functions
o Starting from brain stem to cortex
o Our brain has evolved to add on more and more complex
o Still have the primitive parts of the brain i.e. territoriality
Still have the emotions but may be more complex i.e. go to
a restaurant to buy food, boundaries, passports etc.
x Cerebral cortex
o Vast majority of the brain
o Not smooth
the brains of other animals have smooth cortex
the brain as it expanded, it moves back over the brain and
covers almost everything except cerebellum and begins to
make grooves as it crinkles on itself
x end up with mountains and valleys
x makes boundaries in the brain i.e. this is where vision
end and motor begin
x mountains:jyri (plural) jyrus (singular)
2 sides of the brain are not connected in any obvious way
from the top
x Called hemispheres: right and left
x Connected by a fiber pathway= corpus callosum
o Fibers connect analogous portions to each other
i.e. central to central, posterior to posterior
x Right hemisphere controls left side of the body and
gets info from left side of the body
x Input and output from right side of body controlled
by left hemisphere, this applies for somato sensory
o 3 main cullsi
When get big are referred to as fissures
1. Longitudinal fissure separated left from right (deep
2. Central culcous (deep fissure in the middle of the brain)
3. Cilvian fissure

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x Aka Lateral fissure
x Separates out a lobe (temporal and parietal lobe)
o Cerebral cortex is subdivided into lobes
4 lobes
Every lobe has a specific function
x Frontal lobe (in the front)
x Parietal Lobe (behind central culcous)
x Occipital lobe (very back of head)
x Temporal lobe (portion below cilvian fissure)
Within each lobe:
x Primary function/cortex
o Deals with a major function
o Primary receptive area for the lobe (receives
input from the outside world) i.e. skin-hot or
o Motor cortex=output
o Sensory input=input
x Associational cortex
o Surrounds or is beside the primary cortex
o Computing power of the brain (i.e. cells say
what can we do with this info?)
o Processing more complex phenomena i.e.
recognize face
o Newest in terms of evolution
o More evolved animals have a greater
percentage of associational cortex relative to
primary cortex
Humans has higher proportion of
associational cortex
x Broadman
o Mapped brain according to its function
o Put numbers, used today
o Know: primary cortex number of each
Frontal Cortex
x 4, 6
Parietal cortex
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