ERIC Number: EJ778946
Record Type: Journal
Publication Date: 2007-Nov
Reference Count: 0
The Effects of Context Extinction on US Signal Value
Goddard Murray J.
Learning and Motivation, v38 n4 p314-325 Nov 2007
Two experiments with rats examined the effects of context extinction on responding to the signal value of an unconditioned stimulus (US). In Experiment 1, US signal value was first trained when a single food pellet signaled the delivery of three additional pellets. After training, rats received either context extinction (CE) or home cage (HC) exposure before testing US signal value by single food pellet presentations. Results showed responding was significantly reduced in Group CE compared to Group HC. Experiment 2 replicated Experiment 1 and showed that exposure to a different context did not reduce responding to the signal value of a US. The results complement research by Kehoe et al. [Kehoe, E. J., Weidemann, G., & Dartnall, S. (2004). Apparatus exposure produces profound declines in conditioned nictitating-membrane responses to discrete conditioned stimuli by the rabbit (Oryctolagus cuniculus). "Journal of Experimental Psychology: Animal Behavior Processes," 30, 259-270.] and have key implications for prominent theories of conditioning.
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Publication Type: Journal Articles; Reports - Evaluative
Education Level: N/A
Authoring Institution: Natural Sciences and Engineering Research Council, Ottawa (Ontario).