Rescorla Wagner and Blocking Flashcards

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1
Q

what is a

A

learning rate parameter determined by the salience of CS;

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2
Q

what is B

A

learning rate parameter determined by the salience of the outcome

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3
Q

what is (upside done v with a tail)

A

asymptote of associative strength (V). it has a positive value on episodes when the outcome is US with its magnitude being determined by the effectiveness of US.

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4
Q

what is EV

A

sum of the associative strengths of all CSs present on the learning episode

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5
Q

what is (upside done v with a tail) - EV referred to as

A

prediction error

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6
Q

Bear in mind that associative strength as computed by Rescorla-Wagner does not necessarily translate directly into responding –but we usually assume that the relationship between the two is

A

monotonic

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7
Q

when does the CS perfectly predict behaviour?

A

Trial X= 0.5 (1-1)= 0

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8
Q

example of blocking

A

Blocking happens when you start conditioning with one US and CS pairing (e.g. above with noise and foot shock). In the second stage, a novel CS (light) is added. There will be little or no fear in response to the light alone. It has been blocked. The light does not acquire any predictive value

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9
Q

example of overshadowing

A

conditions start at the same time

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10
Q

what happens here:

First trial = 0.5(1-0+0)= 0.5 = each stimulus gets 0.5

A

On the next trial, there is no more learning. They both stay with their 0.5 predictive strengths.

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11
Q

what does Beckers et al experiment 1 show

A

Experiment 1 demonstrated that under circumstances that result in robust blocking after irrelevant pretraining treatment, explicit exposure to subadditivity during pretraining effectively abolishes blocking

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12
Q

what does Beckers et al experiment 3 show

A

Experiment 3 demonstrated that blocking is obtained more readily if the blocking procedure involves a shock intensity that is submaximal than if the blocking procedure involves the most intense shock intensity that animals have ever experienced, independent of the absolute intensity of the shock.

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