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Memory is categorized into three major systems: sensory memory, short-term memory (STM), and long-term memory (LTM). These systems differ in their capacity and the duration for which they can hold information. Sensory memory captures raw sensory input from the environment, holding it for just a few seconds or less. For example, on hearing a brief, loud sound, like a car horn honking, the sound seems to linger in the mind for a moment even after it stops. This is an instance of sensory memory...
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Working memory refers to a combination of components, including short-term memory and attention, that allow an individual to hold information temporarily as we perform cognitive tasks. It is an essential cognitive function that enables the execution of complex tasks such as problem-solving, comprehension, and reasoning. Unlike short-term memory, which simply involves the storage of information for a brief period, working memory involves the active manipulation and processing of this...
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Long-Term Memory01:18

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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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Emotionally traumatic events often lead to memories that are exceptionally vivid and enduring, sometimes persisting with remarkable clarity throughout an individual's life. A classic example of this phenomenon is a person who survives a car accident. Even years later, they may recall every detail of the event with startling accuracy — the screeching of the tires, the jarring impact, and the acrid smell of burning rubber. Such vividness contrasts sharply with how an individual...
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Engram-specific transcriptome profiling of contextual memory consolidation.

Priyanka Rao-Ruiz1,2, Jonathan J Couey1, Ivo M Marcelo1,3

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|May 22, 2019
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Summary
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Sparse dentate gyrus neurons form fear memories. This study reveals CREB-dependent gene expression in these neurons is crucial for consolidating contextual fear memories and long-term memory encoding.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Sparse neurons in the dentate gyrus (DG) are key for contextual fear memory encoding.
  • Molecular mechanisms of memory consolidation in DG engrams are not well understood.

Purpose of the Study:

  • To identify gene expression changes in DG engram neurons during memory consolidation.
  • To investigate the role of CREB in DG engram-mediated memory consolidation.

Main Methods:

  • Unbiased RNA sequencing of DG engram neurons post-fear conditioning.
  • Validation of RNA sequencing findings through functional experiments.

Main Results:

  • DG engram neurons show a distinct gene expression profile after fear conditioning.
  • CREB-dependent transcription, including Atf3, Penk, and Kcnq3, is prominent.
  • Intact CREB function in DG engrams is essential for memory consolidation.

Conclusions:

  • CREB-dependent transcription in DG engrams is critical for contextual fear memory consolidation.
  • Novel CREB target genes involved in long-term memory encoding were identified.