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Related Concept Videos

Brain Waves01:23

Brain Waves

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Brain waves are electrical signals generated by the neurons in the brain, which are regularly monitored to measure mental activities. Brain waves and their frequency ranges can be measured using an electroencephalogram or EEG. There are four main types of brain waves, each with distinct characteristics:
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Action Potential01:14

Action Potential

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Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...
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Propagation of Action Potentials01:23

Propagation of Action Potentials

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The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
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Related Experiment Video

Updated: Mar 8, 2026

Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice
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Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice

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Neural Oscillations: Primates Have Sharp Memories Too.

Adrian J Duszkiewicz1, Adrien Peyrache1

  • 1Montreal Neurological Institute and Hospital, McGill University, Montreal, Canada.

Current Biology : CB
|January 25, 2017
PubMed
Summary

Sharp wave-ripples, crucial for memory formation in mammals, have now been shown to be important for memory in primates, expanding our understanding of these hippocampal signals.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Memory Research

Background:

  • Sharp wave-ripples (SWRs) are transient, high-frequency oscillations originating in the hippocampus.
  • These neural oscillations are widely studied for their role in memory consolidation across mammalian species.
  • Previous research primarily focused on the function of SWRs in rodent models.

Purpose of the Study:

  • To investigate the role of sharp wave-ripples in memory formation in primates.
  • To determine if hippocampal SWRs contribute to memory processes in non-rodent mammals.

Main Methods:

  • Electrophysiological recordings in the primate hippocampus.
  • Analysis of sharp wave-ripple activity during memory tasks.
  • Comparison of SWR characteristics with memory performance.

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Automatic Detection of Highly Organized Theta Oscillations in the Murine EEG
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Automatic Detection of Highly Organized Theta Oscillations in the Murine EEG

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Related Experiment Videos

Last Updated: Mar 8, 2026

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

12.4K
Automatic Detection of Highly Organized Theta Oscillations in the Murine EEG
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Automatic Detection of Highly Organized Theta Oscillations in the Murine EEG

Published on: March 10, 2017

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Author Spotlight: Investigating Vocal Information Representation in Small Primates and Its Alteration by Psychiatric Disorders Using Noninvasive EEG
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Author Spotlight: Investigating Vocal Information Representation in Small Primates and Its Alteration by Psychiatric Disorders Using Noninvasive EEG

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Main Results:

  • Sharp wave-ripples were identified in the primate hippocampus.
  • The occurrence and characteristics of SWRs correlated with memory performance.
  • Evidence suggests SWRs are involved in primate memory formation.

Conclusions:

  • Hippocampal sharp wave-ripples play a significant role in memory formation in primates.
  • These findings extend the known importance of SWRs beyond rodents.
  • The study highlights conserved mechanisms of memory across mammalian brains.