103_4_full

2100 488 102 associative strength v 60 50 40 30 20 10

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Unformatted text preview: al 19 Rescorla–Wagner model Conditioning with a single CS ΔV = α(λ-V) An application to conditioning with a single CS On Trial 4, the change in associative strength will be even less, for now V= 49 ΔV = 0.2(100- 48.8) = 10.2 Associative Strength (V) 60 50 40 30 20 10 0 Trial 0 Trial 1 Trial 2 Trial 3 Trial 4 Trial And so on until V = λ (100), and therefore ΔV = 0 20 Rescorla–Wagner model Extinction Value of 0 is substituted for λ : Suppose that conditioning had previously progressed to asymptote, i.e. V = λ On extinction trial 1, the the change in associative strength will be: Extinction ΔV = 0.2(0-100) = -20 On extinction trial 2, the change in associative strength will be less, because now V= 80 ΔV = 0.2(0-80) = -16 And so on until V = 0, and therefore ΔV = 0 21 Rescorla–Wagner model US intensity - Variations in the intensity of the US are simulated by varying the value of λ Large US (λ) Intense US = high value of λ (e.g. 100) Weaker US = lower value of λ (e.g. 50) - Reducing the value of λ has two effects: (1) Rate of conditioning is sl...
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