PSYC214 Lecture 9: Extinction
Document Summary
What is extinction: pc (pavolvian conditioning) and ic (instrumental conditioning) involve acquiring conditioned behaviour, extinction occurs when we omit the us (in pc) or the reinforcing outcome (in ic) First, lets look at extinction effects: example: vending machine, behavioural effects of extinction, target response decreases. Skinner boxes altered to create 2 different "contexts" (a and b) for rats. Lever pressing reinforced with food (standard ic) in context (box) a: the next day extinction training (no reinforcement for lever pressing) occurred in context b, test: measure lever press responding in both context a and context b. After extinction has occurred: addicts in a rehab in context a they decrease but the replase in context b has extinction has not been occurred in that context. Less vs more extinction trails: more is better, massed (present them close together) vs spaced trails, massed (trails one after the other): faster decrease in behaviour but more likely to show spontaneous recovery or renewal effects.
