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Related Experiment Videos

Proprioceptive evoked gamma oscillations.

Sidse M Arnfred1, Lars Kai Hansen, Josef Parnas

  • 1Department of Psychiatry, Hvidovre Hospital, University Hospital of Copenhagen, Brøndbyøstervej 160, 2605 Brøndby, Denmark. s.arnfred@tdcadsl.dk

Brain Research
|March 27, 2007
PubMed
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Natural proprioceptive stimuli, like weight changes, can evoke gamma oscillations in the brain. This study observed both predicted 40 Hz and unexpected 20 Hz activities, suggesting early somatosensory feature integration.

Area of Science:

  • Neuroscience
  • Somatosensory System
  • Electrophysiology

Background:

  • Previously, somatosensory gamma oscillations were only evoked by electrical stimuli.
  • A recent study showed weight changes elicit evoked potentials.

Purpose of the Study:

  • To investigate if natural proprioceptive stimuli can evoke gamma oscillations.
  • To explore the characteristics of these oscillations.

Main Methods:

  • Electroencephalography (EEG) recorded from 64 channels in 14 healthy subjects.
  • A 100 g load increment stimulus was applied to each hand.
  • Wavelet transformation and inter-trial phase coherence (ITPC) analysis were used to assess oscillations (25-75 Hz, 0-200 ms).

Main Results:

Related Experiment Videos

  • A 40 Hz oscillation was observed 60 ms post-stimulus in the contralateral parietal region.
  • An unexpected 20 Hz oscillation was detected in the frontal-central region.
  • Gamma phase locking suggests early somatosensory feature integration.

Conclusions:

  • Natural proprioceptive stimuli can indeed evoke gamma oscillations.
  • The high-frequency activity appears to involve at least two distinct oscillatory processes.
  • Further research is needed to fully understand these underlying mechanisms.