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Long-term memory is a relatively permanent type of memory, capable of storing vast amounts of information over extended periods. Its storage capacity is generally considered unlimited.
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C. elegans Positive Butanone Learning, Short-term, and Long-term Associative Memory Assays
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[Long-Term Contextual Memory in Mice: Persistence and Associability with Reinforcement].

N S Vorobyeva, O I Ivashkina, K A Toropova

    Zhurnal Vysshei Nervnoi Deiatelnosti Imeni I P Pavlova
    |January 30, 2019
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    Summary
    This summary is machine-generated.

    Mice can form fear memories associating a context with a shock stimulus, even after long delays. This associative learning is context-specific and persists for at least 30 days.

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    Area of Science:

    • Neuroscience
    • Behavioral Science
    • Memory Research

    Background:

    • The context preexposure effect demonstrates that animals can link environmental context with unconditioned stimuli, even with extended intervals.
    • This phenomenon was initially observed and studied in rats.

    Purpose of the Study:

    • To investigate the association of previously acquired contextual memory with an unconditioned stimulus (immediate shock) in mice.
    • To determine the specificity and persistence of fear memory in this model.

    Main Methods:

    • Mice were exposed to a specific context to acquire contextual memory.
    • An unconditioned stimulus (immediate shock) was presented after a spaced interval.
    • Fear memory specificity and duration were assessed.

    Main Results:

    • Fear memory was specific to the previously explored context, not the context of the immediate shock.
    • Associative learning occurred when the interval between contextual memory acquisition and shock was between 30 minutes and 30 days.
    • The learned fear memory remained stable and persisted for at least 30 days.

    Conclusions:

    • Mice exhibit context-specific fear memory formation analogous to the context preexposure effect observed in rats.
    • This study establishes a valuable model for investigating the neuronal mechanisms underlying associative memory.
    • The findings support the use of transgenic reporter mice for future research in this area.