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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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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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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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Storage01:23

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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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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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Related Experiment Video

Updated: Nov 23, 2025

Brain Imaging Investigation of the Memory-Enhancing Effect of Emotion
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The physical basis of memory.

C R Gallistel1

  • 1Rutgers Center for Cognitive Science, Rutgers The State University of New Jersey, 252 7th Ave 10D, New York, NY 10001, United States of America.

Cognition
|December 30, 2020
PubMed
Summary
This summary is machine-generated.

Neuroscientists must update the conceptual framework for the engram, moving beyond John Locke's theory of mind. A new framework, informed by information theory and molecular biology, is essential for understanding memory transmission.

Keywords:
Communication channelEngramMoleculesPlastic synapse

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Molecular Biology

Background:

  • The search for the engram, the physical trace of memory, is currently framed by John Locke's theory of mind.
  • This framework predates key scientific developments including information theory, computation, and molecular genetics.

Purpose of the Study:

  • To propose a shift in the conceptual framework for engram research.
  • To integrate modern scientific understanding into the search for the engram.

Main Methods:

  • Conceptual analysis of existing frameworks.
  • Integration of principles from information theory, computation, and molecular biology.

Main Results:

  • The current framework based on Locke's theory is insufficient for understanding the engram.
  • A new framework is needed that incorporates information processing and molecular mechanisms.

Conclusions:

  • The engram is the medium for transmitting information from past experiences to guide future behavior.
  • The information-carrying symbols within the engram are likely molecular in nature, rapidly generated during neural computations.