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PSYA01H3 Lecture Notes - Habituation, Drools

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Steve Joordens

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Psychology Lecture 26 (Chapter 6&7)
Slide 45: Even though our bounces with each move, our eyes adjusts in order to keep our vision stable.
There’s actually constant change in our world, but they’re irrelevant, which the brain filters out.
Slide 46: One image is slightly brighter than the other. For example, while you’re talking to something, a
cloud comes over, and that causes a shadow that changes the lighting. However, our visual system
keeps it constant so we don’t see it as a big deal when the world changes.
Slide 47: When you look at a closed door, it’s rectangular, but once you open it (right image), the
geometry is different, but we don’t perceive it as a big change. The brain corrects for the change in
geometry by making us see a rectangular from a different orientation. This is another example how our
brain attempts to make our vision stable and constant. These changes are irrelevant and our brain looks
at the reality.
Slide 48: Even if not mentioned in lecture, pay attention to the textbook.
When the car moves, objects seem to move in the opposite direction when it stops. There are motion
cortex that increase firing, but when they stop they may overshoot, which causes that small moment of
perception of objects moving in the opposite direction.
Chapter 7
Slide 2: both our genes and the environment affect our behavior. But how? How can we use these
principles of nature vs nurture to explain the behavior?
Slide 3: When we were born, we had some hardwired behavior (like infants know immediately to suck
on a nipple when feeding the first time, or dodging reflex when something flies at you) unconditioned
(automatic, you didn’t learn).
UCS- a stimuli that is automatic, like food entering your stomach
UCR- a response to the UCS, like digestive process to the food entering
Slide 4: Habituation ex: a dog seeing a mirror reflection, they bark at it at first, but eventually they
ignore it. They realize that it doesn’t smell or feel like a dog, and it doesn’t have any effect on the dog,
so they feel indifferent to it.
Habituation- breaking the link between UCS and UCR.
The role of the UCS and UCR only work when they are together. Think of it this way- if there is no
response, you wouldn’t consider something a stimulus.
Slide 5: Pavlolv was a physiologist studying digestive systems. He studied on dogs by measuring their
saliva, because it is a good way to sense how much the digestive process works.
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