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Automatic Detection of Highly Organized Theta Oscillations in the Murine EEG
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High frequency oscillations are associated with cognitive processing in human recognition memory.

Michal T Kucewicz1, Jan Cimbalnik2, Joseph Y Matsumoto1

  • 11 Department of Neurology, Mayo Clinic, 200 First St SW, Rochester MN, 55905, USA.

Brain : a Journal of Neurology
|June 13, 2014
PubMed
Summary
This summary is machine-generated.

High frequency brain oscillations, including high gamma, ripple, and fast ripple bands, are crucial for memory encoding and recall. These oscillations are generated across widespread brain regions, supporting cognitive functions.

Keywords:
cognitive processinggamma oscillationshigh frequency oscillationsmemoryneural networks

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Electrophysiology

Background:

  • High frequency oscillations (HFOs) are linked to normal brain function and epilepsy.
  • Classical gamma frequencies (30-100 Hz) are studied for cognition, but HFOs beyond this range are less understood.
  • Investigating HFOs beyond gamma is crucial for understanding human cognitive processing.

Purpose of the Study:

  • To investigate high frequency oscillations (high gamma, ripple, fast ripple) during memory encoding and recall.
  • To determine the role of these oscillations in visual processing, limbic, and cortical regions.
  • To explore if HFOs can discriminate encoded and affectively charged images.

Main Methods:

  • Intracranial recordings from 12 patients (21-63 years) during memory tasks.
  • Analysis of high frequency oscillations in high gamma (50-125 Hz), ripple (125-250 Hz), and fast ripple (250-500 Hz) bands.
  • Localization of oscillations in primary visual, limbic, and higher-order cortical regions, including amygdala and hippocampus.

Main Results:

  • High frequency oscillations were induced in all three bands across visual, limbic, and cortical regions.
  • Memory encoding and recall significantly modulated HFO detections in studied structures.
  • HFOs in primary sensory areas increased during encoding (P = 0.002), and in higher-order areas during recall (P = 0.001).
  • Induced HFOs discriminated between encoded and affectively charged images.

Conclusions:

  • High frequency oscillations across a wide frequency range are associated with memory processing.
  • These oscillations are generated in distributed cortical and limbic brain regions.
  • Fast network synchronization plays a significant role in human cognition and memory.