Memory destabilization is critical for the success of the reactivation-extinction procedure

Learning & Memory
Marcelo E PiñeyroGonzalo P Urcelay

Abstract

It has been suggested that, unlike pure extinction which typically results in the return of the fear response under a variety of circumstances, memory reactivation followed by extinction can attenuate the reemergence of conditioned fear. The reactivation-extinction procedure has attracted the attention of basic and clinical researchers due to its potential clinical value for the treatment of psychiatric conditions, such as anxiety and drug abuse disorders. However, mixed results have been achieved so far in replicating and understanding this paradigm. It has been proposed that memory destabilization could be critical in this sense. Using contextual fear conditioning in rats and midazolam as an amnesic agent, we first determined what reactivation conditions are necessary to destabilize the mnemonic trace. After establishing the conditions for memory destabilization, a series of experiments was conducted to determine if destabilization is critical for the success of the reactivation-extinction procedure. Data confirmed the importance of memory destabilization prior to extinction inside the reconsolidation window to attenuate spontaneous recovery and retard reacquisition of conditioned fear. The present report offers a candidate e...Continue Reading

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