PBSI 340 - Post Exam 3 Material (But Before The
final) With Complete Solutions
What is extinction? (review) - ANSWER Reduction in behavioral
responding after non-reinforced trials
How is extinction important for normal cognition? - ANSWER Updating
previous information
Example: Food truck locations on campus are switching day-to-day
How is extinction important for psychiatric illness? - ANSWER Unlearning
anxiety, fear, and trauma
Example: Exposure therapy
Is extinction simply just unlearning? - ANSWER Kinda
EX:
Rat on a runway
-Let's say we food-deprive a rat, then place it on a long runway with a food
reward at the end
-We subject the rat to 20 trials with a food reward for a nice,
strong association
-Then we subject the rat to 20 extinction trials followed by a test
What happens?
ANS: they slowly realize the food is not going to be there anymore
THEN:
-Let's wait 1 week and test the rat again
What will happen?
ANS: spontaneous recovery - the rat will quickly remember there used to
be food down that runway
What is spontaneous recovery? (review) - ANSWER A period of increased
responding following a rest period away from extinction
, What is renewal? - ANSWER A period of increased responding due to
extinction taking place in an alternate environment
EX:
-Instead of performing extinction trials in room A, we take the rat to an
identical runway in room B and perform
20 extinction trials there
-Then, we bring the rat back to Room A and test their behavior
ANS: A small amount of A learning will return even after B learning has
taken place. It is harder to remember A in a different setting
What is reinstatement? - ANSWER Exposure to a US alone leads to a
period of increased responding to the CS
EX:
-After extinction, we place the animal on the reward end of the runway
alongside the normal food reward and
allow it to eat
-We then perform a normal trial under extinction conditions
ANS: They are going to go for it after some exposure
So, why is extinction not just unlearning? - ANSWER Memory of the
association persists beyond extinction trials and can shape future behavior
What is the first view about extinction? - ANSWER Increasing the
proportion of reinforced trials increases
learning
TEST:
-We have two rats.
-Rat #1 will get 20 trials of reinforced training.
-Rat #2 will get 30.
-Afterward, we measure rates of extinction
ANS: rat with 30 trials is going to experience more learning
What is the partial reinforcement extinction effect? (PREE) - ANSWER An
animal with less reinforcement results in more learning
TEST:
-We have 4 rats, and each gets 100 trials of training,
-BUT each rat gets a different proportion of reinforced trials (30%, 50%,
80%, 100%)
Which rats will extinguish fastest?
final) With Complete Solutions
What is extinction? (review) - ANSWER Reduction in behavioral
responding after non-reinforced trials
How is extinction important for normal cognition? - ANSWER Updating
previous information
Example: Food truck locations on campus are switching day-to-day
How is extinction important for psychiatric illness? - ANSWER Unlearning
anxiety, fear, and trauma
Example: Exposure therapy
Is extinction simply just unlearning? - ANSWER Kinda
EX:
Rat on a runway
-Let's say we food-deprive a rat, then place it on a long runway with a food
reward at the end
-We subject the rat to 20 trials with a food reward for a nice,
strong association
-Then we subject the rat to 20 extinction trials followed by a test
What happens?
ANS: they slowly realize the food is not going to be there anymore
THEN:
-Let's wait 1 week and test the rat again
What will happen?
ANS: spontaneous recovery - the rat will quickly remember there used to
be food down that runway
What is spontaneous recovery? (review) - ANSWER A period of increased
responding following a rest period away from extinction
, What is renewal? - ANSWER A period of increased responding due to
extinction taking place in an alternate environment
EX:
-Instead of performing extinction trials in room A, we take the rat to an
identical runway in room B and perform
20 extinction trials there
-Then, we bring the rat back to Room A and test their behavior
ANS: A small amount of A learning will return even after B learning has
taken place. It is harder to remember A in a different setting
What is reinstatement? - ANSWER Exposure to a US alone leads to a
period of increased responding to the CS
EX:
-After extinction, we place the animal on the reward end of the runway
alongside the normal food reward and
allow it to eat
-We then perform a normal trial under extinction conditions
ANS: They are going to go for it after some exposure
So, why is extinction not just unlearning? - ANSWER Memory of the
association persists beyond extinction trials and can shape future behavior
What is the first view about extinction? - ANSWER Increasing the
proportion of reinforced trials increases
learning
TEST:
-We have two rats.
-Rat #1 will get 20 trials of reinforced training.
-Rat #2 will get 30.
-Afterward, we measure rates of extinction
ANS: rat with 30 trials is going to experience more learning
What is the partial reinforcement extinction effect? (PREE) - ANSWER An
animal with less reinforcement results in more learning
TEST:
-We have 4 rats, and each gets 100 trials of training,
-BUT each rat gets a different proportion of reinforced trials (30%, 50%,
80%, 100%)
Which rats will extinguish fastest?
