Psychology 3030RWhomework

Psychology 3030RWhomework - Be specific. c) Suppose in...

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Psychology 3030/6016 Homework Rescorla-Wagner Model Do the following problems ON YOUR OWN. Due Thursday, February 13. Show your work carefully and completely. Be prepared to present your results in class. 1. Consider the following experiment: In Phase I a tone, T, (K = 0.4) and a light, L, (K = 0.4) are paired separately with a shock ( λ = 90). The pairing trials are randomly intermixed until the asymptotic associative strength is nearly reached for each CS. a) Show the course of conditioning according to the Rescorla-Wagner model for just one of the CS’s over four trials. b) In Phase II of the experiment, after the light and tone have each reached asymptotic associative strength, i.e., V L = V T = 90, the light and tone are combined with a new stimulus, a clicker, C (K = 0.4) and this compound stimulus (L + T + C) is paired with the shock. Illustrate what happens to the associative strength of each of these stimuli. What property is conferred to the clicker? How could you show this?
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Unformatted text preview: Be specific. c) Suppose in Phase II, the shock was increased in intensity so that λ = 180, how would this have changed the results in (b) above? 2. Carefully compare Blocking with Overshadowing. Illustrate with specific examples using your own Rescorla-Wagner parameters. According to the Rescorla-Wagner model, what can happen with blocking if, when you add a new CS, you increase the intensity of the UCS? Illustrate. What would happen if you decreased the intensity of the UCS? Is the model correct here? In general, what are the limitations of the Rescorla-Wagner model, i.e., what phenomena are not accounted for? 3. How are the contingencies specified by conditional probabilities of the UCS, given the CS or ~CS related to the Rescorla-Wagner model? More specifically, why would the Rescorla-Wagner model predict conditioning to the CS when: P(UCS | CS) >P(UCS |~CS), and no conditioning to the CS when: P(UCS | CS) = P(UCS | ~CS)?...
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This note was uploaded on 06/01/2008 for the course PSYC 3031 taught by Professor Unknown during the Spring '06 term at Georgia Tech.

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