Answers to Simulations of the Rescorla-Wagner Model Acquisition ...

Overexpectation
Simulate five trials of overexpectation for the experimental group only.
Assume that Phase 1 training (AUS, BUS training is complete). For
this simulation simulate 5 trials of Phase 2 (ABUS). Assume that k A =
.2 and k B = .2 and that the associative strength of both A and B are
equal to 1 following Phase 1 (i.e., Va = 1 and Vb = 1).
Group Phase 1 Phase 2 Test Observe
Overexpectation A-->US / B-->US AB-->US b cr
Control A-->US / B-->US no training b CR
Group Overexpectation (Phase 2)
Trial ΔV A V A ΔV B V B
1 -.20 .80 -.20 .80
2 -.12 .68 -.12 .68
3 -.07 .61 -.07 .61
4 -.04 .56 -.04 .56
5 -.03 .54 -.03 .54
How does the associative strength of CSs A and B change compared to
the control group (the associative strength of CSs A and B at the end of
Phase 1)? Why does CS B elicit a weaker conditioned response in the
Overexpectation group relative to the control group? Discuss in terms of
surprise.