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Two spaced training trials induce associative ERK-dependent long term memory in Neohelice granulata
Santiago Ojea Ramos1, Matías Andina1, Arturo Romano1
1Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE), UBA-CONICET, Buenos Aires, Argentina, and Departamento de Fisiología, Biología Molecular y Celular "Dr Héctor Maldonado", Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina.
Researchers discovered a new two-trial training method to create long-term memory (LTM) in crabs, using a longer inter-trial interval (ITI). This efficient protocol aids in studying memory formation mechanisms.
Area of Science:
- Neuroscience
- Animal Behavior
- Learning and Memory
Background:
- Long-term memory (LTM) formation is influenced by training parameters like trial number and inter-trial interval (ITI).
- Traditional protocols for associative LTM in Neohelice granulata crabs require 15 spaced trials (3 min ITI).
- The contribution of individual training trials to memory mechanisms remains incompletely understood.
Purpose of the Study:
- To investigate if LTM can be induced in Neohelice granulata with fewer training trials.
- To establish a novel, efficient training protocol for studying memory formation and consolidation.
- To analyze the role of ERK activation in memory formation under the new protocol.
Main Methods:
- Implemented a new training protocol using only two trials with an increased ITI of 45 min (2t-LTM).
- Assessed LTM duration, protein synthesis dependence during consolidation/reconsolidation, and context-specificity.
- Measured inter-trial and post-training ERK activation patterns.
Main Results:
- LTM was successfully induced with only two trials (2t-LTM), lasting at least 96 hours.
- The 2t-LTM exhibited protein synthesis dependence and context-specificity.
- 2t-LTM showed reliance on inter-trial and post-training ERK activation, with faster phosphorylation after the second trial.
Conclusions:
- A reduced two-trial training protocol can effectively induce associative LTM in crabs.
- This novel protocol offers a more efficient method for studying memory consolidation and the impact of individual trials.
- The findings highlight the plasticity of memory formation and provide a new tool for neuroscience research.
