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Related Concept Videos

Long-Term Memory01:18

Long-Term Memory

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...
Long-term Potentiation01:35

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Long-term Potentiation01:25

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
LTP can occur when presynaptic neurons...
Role of Hippocampus in Memory01:19

Role of Hippocampus in Memory

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...
Role of Cerebellum and Prefrontal Cortex in Memory01:14

Role of Cerebellum and Prefrontal Cortex in Memory

The cerebellum, while traditionally associated with motor control, also plays a crucial role in memory, particularly in procedural memory, which involves learning motor tasks that become automatic through repetition. For example, studies have shown that when the cerebellum is damaged, individuals or animals lose the ability to learn conditioned motor responses, such as the conditioned eye-blink response in classical conditioning experiments with rabbits. This study demonstrates the cerebellum's...

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Related Experiment Video

Updated: Jul 2, 2026

Recording Spatially Restricted Oscillations in the Hippocampus of Behaving Mice
07:10

Recording Spatially Restricted Oscillations in the Hippocampus of Behaving Mice

Published on: July 1, 2018

Phase-locking within human mediotemporal lobe predicts memory formation.

Juergen Fell1, Eva Ludowig, Timm Rosburg

  • 1Department of Epileptology, University of Bonn, Bonn, Germany. juergen.fell@ukb.uni-bonn.de

Neuroimage
|August 16, 2008
PubMed
Summary
This summary is machine-generated.

Precise timing of brainwaves in the mediotemporal lobe (MTL), specifically early rhinal and hippocampal phase-locking, best predicts declarative memory encoding. This suggests phase adjustments are key to forming conscious memories.

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Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice
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Related Experiment Videos

Last Updated: Jul 2, 2026

Recording Spatially Restricted Oscillations in the Hippocampus of Behaving Mice
07:10

Recording Spatially Restricted Oscillations in the Hippocampus of Behaving Mice

Published on: July 1, 2018

Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice
07:33

Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice

Published on: June 29, 2018

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience

Background:

  • Declarative memory encoding involves the rhinal cortex and hippocampus within the mediotemporal lobe (MTL).
  • Previous studies show N400 and hippocampal positivity, alongside rhinal-hippocampal synchronization, correlate with memory formation.

Purpose of the Study:

  • To determine which electroencephalogram (EEG) measures from the MTL most accurately predict successful memory formation.
  • To compare the predictive power of event-related potentials, phase synchronization, inter-trial phase-locking, and power changes.

Main Methods:

  • Intracranial EEG recordings from the rhinal cortex and hippocampus in 31 epilepsy patients.
  • Analysis of EEG characteristics during a continuous word recognition paradigm.
  • Evaluation of classical event-related potentials, rhinal-hippocampal synchronization, inter-trial phase-locking, and power changes.

Main Results:

  • Inter-trial phase-locking was found to be superior to other EEG measures in predicting subsequent memory.
  • Early rhinal and hippocampal phase-locking in the alpha/beta range (100-300 ms post-stimulus) was a strong precursor to successful memory formation.
  • Memory formation is linked to the precise timing of EEG phases within the MTL relative to stimulus onset.

Conclusions:

  • Inter-trial phase-locking is a highly accurate predictor of declarative memory encoding.
  • Early mediotemporal phase adjustments, particularly in the alpha/beta range, represent a crucial mechanism for memory formation.
  • The precise timing of neural oscillations within the MTL is fundamental to encoding consciously accessible memories.