Proactive and retroactive interference with associative memory consolidation in the snail Lymnaea is time and circuit dependent

Crossley, Michael, Lorenzetti, Frederick D, Naskar, Souvik, O'Shea, Michael, Kemenes, György, Benjamin, Paul R and Kemenes, Ildikó (2019) Proactive and retroactive interference with associative memory consolidation in the snail Lymnaea is time and circuit dependent. Communications Biology, 2 (242). pp. 1-11. ISSN 2399-3642

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Abstract

Interference-based forgetting occurs when new information acquired either before or after a learning event attenuates memory expression (proactive and retroactive interference, respectively). Multiple learning events often occur in rapid succession, leading to competition between consolidating memories. However, it is unknown what factors determine which memory is remembered or forgotten. Here, we challenge the snail, Lymnaea, to acquire two consecutive similar or different memories and identify learning-induced changes in neurons of its well-characterized motor circuits. We show that when new learning takes place during a stable period of the original memory, proactive interference only occurs if the two consolidating memories engage the same circuit mechanisms. If different circuits are used, both memories survive. However, any new learning during a labile period of consolidation promotes retroactive interference and the acquisition of the new memory. Therefore, the effect of interference depends both on the timing of new learning and the underlying neuronal mechanisms.

Item Type: Article
Keywords: associative learning, memory consolidation, interference, memory circuits
Schools and Departments: School of Life Sciences > Neuroscience
Research Centres and Groups: Sussex Neuroscience
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Depositing User: Ildiko Kemenes
Date Deposited: 01 Nov 2019 08:50
Last Modified: 06 Nov 2019 09:00
URI: http://sro.sussex.ac.uk/id/eprint/87728

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Project NameSussex Project NumberFunderFunder Ref
Updating of memories during memory consolidationG2208BBSRC-BIOTECHNOLOGY & BIOLOGICAL SCIENCES RESEARCH COUNCILBB/P00766X/1
Lapses in memory: opportunities for adaptive behaviourG1199BBSRC-BIOTECHNOLOGY & BIOLOGICAL SCIENCES RESEARCH COUNCILBB/K018515/1