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Partial reinforcement in appetitive Pavlovian conditioning with rats
J M Pearce1, E S Redhead, A Aydin
1School of Psychology, University of Wales, Cardiff, U.K.
Summary
Extinction learning is slower after partial reinforcement compared to continuous reinforcement. Contextual cues created during partial reinforcement training enhance extinction retention.
Area of Science:
- Behavioral psychology
- Learning and memory
Background:
- Partial reinforcement schedules are known to prolong instrumental response rates during extinction.
- Pavlovian conditioning extinction is a critical process for adaptive behavior.
Purpose of the Study:
- To investigate the impact of partial reinforcement schedules on extinction rates in Pavlovian conditioning.
- To explore the role of context and reinforcement schedules in extinction learning.
Main Methods:
- Four experiments utilized appetitive Pavlovian conditioning with partial and continuous reinforcement schedules.
- Extinction rates were measured by comparing response levels after reinforcement cessation.
Main Results:
- Extinction was slower following partial reinforcement when schedules were between-groups (Experiment 1).
- When schedules were within-group in the same context, extinction was faster after partial reinforcement (Experiments 2 & 3).
- Contextual shifts enhanced extinction more after partial reinforcement (Experiment 4).
Conclusions:
- The nonreinforced trials in partial reinforcement create internal states acting as contextual cues.
- These cues influence extinction retention and susceptibility to contextual changes.