103_4_full

This mental work will occur only if the us is

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Unformatted text preview: iative connection to occur, it is necessary that the US instigate some ‘mental work’ on behalf of the animal. This mental work will occur only if the US is unpredicted – if it in some sense ‘surprises’ the animal.” Kamin, 1969, p. 59 Led to the development of the influential Rescorla–Wagner (1972) model 13 Rescorla–Wagner model Typical learning curve Conditioning with a single CS Typical characteristics of a learning curve: -  At first CR is low (because CS is novel), -  Then, a rapid increase in CR, -  Finally, very little change in CR Rescorla & Wagner: Assumptions Adapted from Kehoe et al. 1994. 1.  Strength of the CS–US association = strength of the CR 2.  Thus CS-US association must be zero at first 3.  Then CS-US association grows quickly at first, before slowing 14 Rescorla–Wagner model Conditioning with a single CS Associative strength: Strength of the connection between internal representations of the CS and US. The change in associative strength ( ΔV ) on each conditioning is determined by: ΔV = α(λ-V) α = Learning rate parameter determined by the properties of the CS & US V= Current strength of the CS→US association λ = Magnitude of the US, reflects the maximum CS →US association (learning) possible Kamin’s “surprise” is expressed as (λ-V) : “What you got” - “What you expected” Learning on each trial ‘ΔV’ is proportional to...
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This note was uploaded on 03/24/2012 for the course PSYC 103 taught by Professor Pearlberg during the Spring '07 term at UCSD.

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