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Related Concept Videos

Brain Waves01:23

Brain Waves

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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Evaluation of Hemisphere Lateralization with Bilateral Local Field Potential Recording in Secondary Motor Cortex of Mice
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Human gamma-frequency oscillations associated with attention and memory.

Ole Jensen1, Jochen Kaiser, Jean-Philippe Lachaux

  • 1F.C. Donders Centre for Cognitive Neuroimaging, Kapittelweg 29, 6525 EN Nijmegen, the Netherlands.

Trends in Neurosciences
|May 15, 2007
PubMed
Summary

Gamma-frequency synchronization in the brain is vital for sensory processing, attention, and memory. This review explores recent findings on human gamma-band activity in cognitive functions, highlighting its role in neuronal communication.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Computational Neuroscience

Background:

  • Transient oscillatory synchronization of neuronal assemblies at gamma frequencies (30-100 Hz) is theoretically and experimentally linked to sensory processing.
  • Recent studies suggest gamma-frequency activity plays a crucial role in attention, working memory, and long-term memory.

Purpose of the Study:

  • To review recent findings on human gamma-frequency activity associated with attention and memory.
  • To discuss the role of gamma-band synchronization in cognitive paradigms.
  • To explore the implications of gamma-frequency activity for understanding neuronal processing in cortical networks.

Main Methods:

  • Investigation using intracranial and high-density electroencephalography (EEG) and magnetoencephalography (MEG) recordings in humans.
  • Analysis of human gamma-frequency activity in both sensory and non-sensory brain areas.
  • Review of theoretical and experimental animal work on gamma oscillations.

Main Results:

  • Human gamma-frequency activity is demonstrably associated with attention and memory.
  • Gamma-band synchronization is involved in various cognitive paradigms.
  • Evidence supports the role of gamma oscillations in both local and distributed cortical networks.

Conclusions:

  • Oscillatory gamma-frequency activity is fundamental for neuronal communication and synaptic plasticity.
  • Gamma-band synchronization offers a key mechanism for understanding complex cognitive functions.
  • This review contributes to the understanding of physiogenic and pathogenic oscillations in the brain.