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Explicit Memories01:27

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Explicit memories, also known as declarative memories, are consciously remembered, recalled, and reported. Studying for a chemistry exam involves material that will become part of explicit memory. There are two types of explicit memory: episodic and semantic.
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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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Memory is one of the most vital higher mental functions of the brain. Memory is closely related to learning because it enables us to retain information and experiences from our past to use them in our present life. It also helps us to remember facts, events, and skills, such as riding a bike or swimming. There are two types of memory — declarative memory, which involves memorizing facts or events, and procedural memory, which enables us to remember how to do something like writing or...
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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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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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Implicit memories, also known as non-declarative memories, are long-term memories that function outside of conscious awareness. These memories influence behavior and skills without explicit knowledge. This type of memory is evident in tasks like playing tennis, snowboarding, and texting. Implicit memory has three subsystems: procedural memory, conditioning, and priming. This type of memory is essential in various activities, from everyday tasks to specialized skills.
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Memory engrams: Recalling the past and imagining the future.

Sheena A Josselyn1,2,3,4,5, Susumu Tonegawa6,7

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Researchers are exploring the neural basis of memory storage, known as the engram. Recent advances are defining the engram as the fundamental unit of memory, detailing its formation, persistence, and role in recall.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Cellular Biology

Background:

  • The concept of the engram, the physical trace of memory, was first proposed by Richard Semon in 1904.
  • Semon hypothesized that experiences create persistent changes in specific neural cell populations.
  • Modern neuroscience tools have revived interest in studying the neural basis of memory storage.

Purpose of the Study:

  • To review recent advancements in engram research.
  • To evaluate evidence supporting the existence and properties of engrams.
  • To understand the role of neural plasticity in memory formation and retrieval.

Main Methods:

  • Review of current literature on engram research.
  • Analysis of studies utilizing advanced neural imaging and manipulation techniques.
  • Examination of evidence for synaptic plasticity and intrinsic neuronal excitability in engrams.

Main Results:

  • Evidence supporting the existence of engrams as distinct neural substrates for memory.
  • Identification of intrinsic excitability and synaptic plasticity as key mechanisms within engrams.
  • Investigation into the temporal dynamics and lifespan of engrams.

Conclusions:

  • Engram research is progressing with new technologies.
  • Findings are converging to define the engram as the fundamental unit of memory.
  • Understanding engrams is crucial for deciphering memory mechanisms.