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Related Concept Videos

Long-Term Memory01:18

Long-Term Memory

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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.
Long-term memory can be categorized into two primary types: explicit and implicit memory. Explicit memory, also known as declarative memory, involves the conscious recollection of information that we deliberately try to remember, recall, and articulate. This type of memory encompasses specific facts, events, and...
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Neurotransmitters are integral to the brain's communication system, enabling neurons to transmit signals across synapses. This chemical exchange underpins various cognitive functions, including memory processes. The role of neurotransmitters in memory is multifaceted, influencing the encoding, consolidation, and retrieval of memories through their action on different neural circuits.
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A schema is a mental framework that helps individuals organize and interpret information. Schemata, formed from previous experiences, influence how we process new information: how we encode it, the inferences we make, and how we retrieve it. For instance, a schema for what a typical classroom looks like might include desks, a teacher's desk, a whiteboard, and students in such an environment. This expectation helps us quickly understand and navigate new classrooms without needing to analyze...
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Role of Hippocampus in Memory01:19

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The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...
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Role of Amygdala in Memory01:16

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The amygdala is a small, almond-shaped structure responsible for processing and storing memories, particularly those linked to emotions like fear and stress. It plays an essential role in the brain's response to emotionally significant events and often enhances memory formation by triggering stress hormone release. The amygdala is vital for encoding and retrieving memories associated with fear or stress, a process that is adaptive by helping organisms avoid dangerous situations.
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Understanding Memory01:19

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Memory is the retention of information or experiences over time, facilitated through three main processes: encoding, storage, and retrieval. Encoding is the process of inputting information into the memory system. For instance, when listening to a lecture, watching a play, reading a book, or having a conversation, the brain is actively encoding information. This initial stage involves transforming sensory input into a form that can be processed and stored by the brain. Various factors, such as...
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Related Experiment Video

Updated: Jan 15, 2026

Dual Electrophysiological Recordings of Synaptically-evoked Astroglial and Neuronal Responses in Acute Hippocampal Slices
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The astrocytic ensemble acts as a multiday trace to stabilize memory.

Ken-Ichi Dewa1, Kodai Kaseda1,2, Aoi Kuwahara1,2

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Astrocytes form a memory stabilization system. Emotional experiences prime these cells, which then integrate repeated signals to stabilize labile memories, enhancing recall precision.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Recalled memories are temporarily unstable and require stabilization.
  • The mechanism for stabilizing memories of survival-critical, emotionally salient, and repeated experiences is not well understood.

Purpose of the Study:

  • To identify the cellular mechanisms underlying memory stabilization.
  • To elucidate the role of astrocytes in stabilizing labile memories.

Main Methods:

  • Utilized a novel brain-wide Fos tagging and imaging technique to identify astrocytic ensembles.
  • Investigated the induction mechanism of astrocytic ensembles through fear conditioning and recall paradigms.
  • Employed pharmacological and genetic approaches to perturb astrocytic signaling.

Main Results:

  • Identified a specific astrocytic ensemble transcriptionally primed by emotional experience and functionally triggered by repeated experience.
  • Astrocytic Fos ensembles were preferentially recruited in neuronal engram regions and were more prevalent during fear recall than conditioning.
  • Demonstrated a two-step induction mechanism involving initial emotional experience-induced astrocytic state changes and subsequent enhanced noradrenergic responses during recall, leading to Fos and IGFBP2 upregulation.
  • Perturbation of astrocytic ensemble signaling modulated memory stability and precision.

Conclusions:

  • Astrocytes form a multiday trace after experience-dependent neural activity.
  • This astrocytic ensemble captures repeated experiences to stabilize memories.
  • The findings reveal a novel cellular mechanism for memory stabilization involving astrocytes.