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Lecture 10

PSYA01H3 Lecture 10: The Brain! (Part 2)

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Steve Joordens

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Lecture 10: The Brain! Part 2
-there are two strips of brain tissue that is very important, one is the primary sensory strip
(input, it is where anything that touches the body, signals through the brain, different
sensations), the other is the motor strip (for output to the muscles)
-anything that touches the left side of body is felt by the the right sensory strip and vice versa
-if a child is born without a hand, the brain tissue will devote tissue to other parts of the body
like the feet, more senses/feedback from the world with the feet rather than the hands
-phantom limb pain is when people who lost their limb feels like they still have the limb and
pain or itchiness from the limb they don’t have
-the parts of the brain will still become stimulated, even when the part of the body associated
with it isn’t there anymore
-even pain is a construct of the brain
-the sensory strip has the amount of brain tissue devoted to different parts of body, more on
hands and lips
-motor strip has a lot of tissue devoted to the hands for the many functions of the hands and
the mouth for language
-prefrontal lobe is to figure out what to do; planning, thinking, etc.
-most recent developed part of the brain
-if you have damage to the sensory strip, you will not feel anything for the part of the body
-if you are damaged to parts of the motor strip, you will be paralyzed for that part of the body
-there are time when drugs were not used for treatment for people who are always in fights,
and people would be in restraining chairs or chained to the wall
-frontal lobotomy is one way of treating these people which is by severing the frontal lobe from
the rest of the brain and it will cause the person to be very calm but will have side effects
-damage to the frontal lobe will cause them to not care of what others think of them and flat
affect which mean they don’t feel any extreme emotion and may display wrong emotion at the
wrong time (e.g. laugh at a funeral)
-it may also cause them to think more slowly
-frontal lobe patients cannot plan appropriately and would stick to habitual behaviour
-confabulation is similar to lies but these lies do not have any motive or to deceive others and
are obliviously wrong
-perseverance error is when people cannot change the way they do things such as when the
cards are sorted one way for a while, but the rule is changed now and people with damage in
the frontal lobe will not change the way they sort the cards even though they are told it is
-frontal lobe helps with adaptation/change/adjust
-all the lobes’ input goes towards the prefrontal lobe, for decision making and planning
-midbrain has more connection to taste and smell, learn early on about taste and smell for
poison (threat to survival, primitive instinct)
-Subcortical regions are under the cortex
-the brain stem has functions as well
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