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Occasion setting in Pavlovian ambiguous target discriminations
José Lino Oliveira Bueno1, Peter C Holland
1Departamento de Psicologia e Educação-FFCLRP, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
Behavioural Processes
|July 29, 2008
Summary
Rats learned ambiguous Pavlovian discriminations, but stimulus control was weaker than in simpler tasks. Findings suggest occasion setting and retrospective coding strategies were used to solve complex conditional discriminations.
Area of Science:
- Behavioral Neuroscience
- Animal Cognition
- Learning and Memory
Background:
- Pavlovian conditioning involves learning associations between stimuli.
- Serial discriminations present cues sequentially, adding complexity to associative learning.
- Ambiguous targets in serial tasks pose challenges for stimulus control.
Purpose of the Study:
- To investigate how rats solve serial ambiguous target discriminations.
- To compare stimulus control in ambiguous versus standard serial discriminations.
- To explore the role of occasion setting and retrospective coding in complex Pavlovian learning.
Main Methods:
- Rats were trained on a serial ambiguous target discrimination (P-->T+, N-->T-).
- Performance was compared to separate serial feature positive (P-->T+, T-) and negative (N-->W-, W+) discriminations.
- Analysis focused on conditioned responding and transfer patterns.
Main Results:
- Stimulus control was weaker in the ambiguous serial task compared to simpler serial discriminations.
- Conditioned responding patterns suggested the use of occasion setting.
- Transfer data indicated rats employed retrospective coding strategies.
Conclusions:
- Rats utilize occasion setting to solve serial ambiguous target discriminations.
- Retrospective coding strategies are employed in complex Pavlovian conditional discriminations.
- Both feature and target stimuli acquire unique properties during serial discrimination learning.
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