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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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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 depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
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Related Experiment Video

Updated: Feb 26, 2026

Improved Preparation and Preservation of Hippocampal Mouse Slices for a Very Stable and Reproducible Recording of Long-term Potentiation
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Memory Takes Time.

Nikolay Vadimovich Kukushkin1, Thomas James Carew1

  • 1Center for Neural Science, New York University, 4 Washington Place, New York, NY 10003, USA.

Neuron
|July 21, 2017
PubMed
Summary
This summary is machine-generated.

Memory adapts to past events using neural time windows. This system allows the brain to store and recall information across different timescales, influencing future behavior.

Keywords:
cell signalingcoincidenceinformation storagelong-term potentiationmemory consolidationmemory encodingpattern extractionphosphorylationsynaptic plasticitytemporal hierarchy

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Molecular Biology

Background:

  • Memory is crucial for adapting to past events.
  • Neural mechanisms for temporal processing are key to memory formation.
  • Understanding how neurons encode time is fundamental.

Purpose of the Study:

  • To propose a hierarchical model of molecular and cellular time windows in neurons.
  • To explain how these time windows retain past information.
  • To link temporal processing to memory storage at multiple levels.

Main Methods:

  • Theoretical framework based on existing neuroscience research.
  • Analysis of molecular and cellular mechanisms of memory.
  • Conceptual integration of synaptic and circuit-level functions.

Main Results:

  • Memory is an adaptation to temporal properties of past events (frequency, coincidence).
  • A hierarchical system of molecular and cellular time windows retains past information.
  • This system makes various timescales of experience available for behavioral adjustment.

Conclusions:

  • The nervous system's capacity for memory encoding and storage relies on detecting and responding to temporally structured information.
  • This occurs at molecular, cellular, synaptic, and circuit levels.
  • Temporal processing is a fundamental basis for memory.