the transition from memory retrieval to extinction
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ID: 167458
2004
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Abstract
Memory is measured by measuring retrieval. Retrieval is often triggered by the conditioned stimulus (CS); however, as known since Pavlov, presentation of the CS alone generates extinction. One-trial avoidance (IA) is a much used conditioned fear paradigm in which the CS is the safe part of a training apparatus, the unconditioned stimulus (US) is a footshock and the conditioned response is to stay in the safe area. In IA, retrieval is measured without the US, as latency to step-down from the safe area (i.e., a platform). Extinction is installed at the moment of the first unreinforced test session, as clearly shown by the fact that many drugs, including PKA, ERK and protein synthesis inhibitors as well as NMDA receptor antagonists, hinder extinction when infused into the hippocampus or the basolateral amygdala at the moment of the first test session but not later. Some, but not all the molecular systems required for extinction are also activated by retrieval, further endorsing the hypothesis that although retrieval is behaviorally and biochemically necessary for the generation of extinction, this last process constitutes a new learning secondary to the unreinforced expression of the original trace.
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| Authors | ;Cammarota Martín;Barros Daniela M.;Vianna Mónica R.M.;Bevilaqua Lia R.M.;Coitinho Adriana;Szapiro Germán;Izquierdo Luciana A.;Medina Jorge H.;Izquierdo Iván |
| Journal | hypertension (dallas, tex : 1979) |
| Year | 2004 |
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