Updating of aversive memories after temporal error detection is differentially modulated by mTOR across development

Lucille Tallot, Lorenzo Diaz-Mataix, Rosemarie E. Perry, Kira Wood, Joseph E. LeDoux, Anne Marie Mouly, Regina M. Sullivan, Valérie Doyère

Research output: Contribution to journalArticle

Abstract

The updating of a memory is triggered whenever it is reactivated and a mismatch from what is expected (i.e., prediction error) is detected, a process that can be unraveled through the memory's sensitivity to protein synthesis inhibitors (i.e., reconsolidation). As noted in previous studies, in Pavlovian threat/aversive conditioning in adult rats, prediction error detection and its associated protein synthesis-dependent reconsolidation can be triggered by reactivating the memory with the conditioned stimulus (CS), but without the unconditioned stimulus (US), or by presenting a CS-US pairing with a different CS-US interval than during the initial learning. Whether similar mechanisms underlie memory updating in the young is not known. Using similar paradigms with rapamycin (an mTORC1 inhibitor), we show that preweaning rats (PN18-20) do form a long-term memory of the CS-US interval, and detect a 10-sec versus 30-sec temporal prediction error. However, the resulting updating/reconsolidation processes become adult-like after adolescence (PN30-40). Our results thus show that while temporal prediction error detection exists in preweaning rats, specific infant-type mechanisms are at play for associative learning and memory.

Original languageEnglish (US)
Pages (from-to)115-122
Number of pages8
JournalLearning and Memory
Volume24
Issue number3
DOIs
StatePublished - Mar 2017

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ASJC Scopus subject areas

  • Neuropsychology and Physiological Psychology
  • Cognitive Neuroscience
  • Cellular and Molecular Neuroscience

Cite this

Tallot, L., Diaz-Mataix, L., Perry, R. E., Wood, K., LeDoux, J. E., Mouly, A. M., Sullivan, R. M., & Doyère, V. (2017). Updating of aversive memories after temporal error detection is differentially modulated by mTOR across development. Learning and Memory, 24(3), 115-122. https://doi.org/10.1101/lm.043083.116