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Recent Exposure to a Dangerous Context Impairs Extinction and Reinstates Lost Fear Reactions.
Authors:Morris  Richard W; Furlong  Teri M; Westbrook  R Frederick
Abstract:Rats were shocked in a context and then exposed to that context in the absence of shock. Shorter intervals between these extinction trials produced more long-term freezing than did longer ones, and shorter intervals between the final extinction trial and test produced more freezing than did longer ones. A short interval between a context extinction trial and test with an extinguished conditioned stimulus (CS) produced more freezing than did a longer one, and a short interval between a nonreinforced context exposure and an extinguished CS reinstated freezing when the CS was tested 24 hr later. The results suggest that recent fear acts to favor subsequent retrieval of the memory formed at conditioning rather than extinction and to render the retrieved memory more salient. (PsycINFO Database Record (c) 2010 APA, all rights reserved)
Keywords:memory retrieval  extinction impairment  extinction trials  trial interval  context extinction  nonreinforced context exposure  extinguished conditioned stimulus  dangerous context  shock  male rats
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