Korean J Physiol Pharmacol.  2012 Oct;16(5):293-296. 10.4196/kjpp.2012.16.5.293.

Effect of Intensity of Unconditional Stimulus on Reconsolidation of Contextual Fear Memory

Affiliations
  • 1National Creative Research Initiative Center for Memory, Department of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul 151-747, Korea. kaang@snu.ac.kr
  • 2Department of Anatomy, Graduate School of Medicine, Brain Science & Engineering Institute, Kyungpook National University, Daegu 700-842, Korea.
  • 3Department of Brain and Cognitive Sciences, College of Natural Sciences, Seoul National University, Seoul 151-747, Korea.

Abstract

Memory reconsolidation is ubiquitous across species and various memory tasks. It is a dynamic process in which memory is modified and/or updated. In experimental conditions, memory reconsolidation is usually characterized by the fact that the consolidated memory is disrupted by a combination of memory reactivation and inhibition of protein synthesis. However, under some experimental conditions, the reactivated memory is not disrupted by inhibition of protein synthesis. This so called "boundary condition" of reconsolidation may be related to memory strength. In Pavlovian fear conditioning, the intensity of unconditional stimulus (US) determines the strength of the fear memory. In this study, we examined the effect of the intensity of US on the reconsolidation of contextual fear memory. Strong contextual fear memory, which is conditioned with strong US, is not disrupted by inhibition of protein synthesis after its reactivation; however, a weak fear memory is often disrupted. This suggests that a US of strong intensity can inhibit reconsolidation of contextual fear memory.

Keyword

Boundary condition; Contextual fear memory; Memory strength; Protein synthesis inhibitor; Reconsolidation
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