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Related Concept Videos

Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...

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Related Experiment Video

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

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Published on: June 29, 2018

Stochastic resonance modulates neural synchronization within and between cortical sources.

Lawrence M Ward1, Shannon E MacLean, Aaron Kirschner

  • 1Department of Psychology, University of British Columbia, Vancouver, Canada. lward@psych.ubc.ca

Plos One
|December 24, 2010
PubMed
Summary

Adding mild noise enhances neural synchronization in the brain, a process called stochastic resonance (SR). This finding suggests SR may optimize brain network formation for perception, cognition, and action.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Signal Processing

Background:

  • Neural synchronization forms transient networks for perception, cognition, and action.
  • Stochastic resonance (SR) enhances synchronization in neural systems and human behavior.
  • Synchronized brain oscillations are crucial for perception, cognition, and action.

Purpose of the Study:

  • To test if SR-mediated neural synchronization occurs within and between brain areas.
  • To investigate if SR is responsible for observed behavioral SR.
  • To explore the role of noise in auditory cortex 40-Hz transient responses.

Main Methods:

  • Measured the 40-Hz transient response in the human auditory cortex using high-density EEG.
  • Used a deviant-detection paradigm with near-threshold sounds and varying noise levels.
  • Applied independent component analysis and dipole fitting to identify neural sources and inter-regional synchronization.

Main Results:

  • Added broadband noise enhanced the 40-Hz neural response in auditory and other brain regions.
  • Noise increased synchronization between brain regions in alpha and gamma bands.
  • Demonstrated neural SR within and between multiple functionally specific brain areas.

Conclusions:

  • Neural SR facilitates both intra- and inter-regional synchronization of neural activity.
  • SR may optimize the formation of task-relevant brain networks.
  • Fluctuating neural noise levels, influenced by arousal, could leverage SR for network optimization.