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Consciousness

J E Desmedt1, C Tomberg

  • 1Brain Research Unit, University of Brussels, Belgium.

Electroencephalography and Clinical Neurophysiology. Supplement
|January 1, 1995
PubMed
Summary

Consciousness, a brain function with survival value, involves enhanced parietal and prefrontal cortex activity. This neurophysiological study reveals 40 Hz oscillations binding these areas during conscious perception and motor response decisions.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neurophysiology

Background:

  • Consciousness is a subjective, private experience intrinsic to brain function.
  • A Darwinian perspective suggests conscious brain function has survival value.
  • Understanding consciousness requires neurophysiological investigation.

Purpose of the Study:

  • To investigate the neurophysiological basis of consciousness using somatic sensory processing.
  • To assess brain activity during conscious perception and motor response.
  • To identify neural mechanisms underlying conscious awareness.

Main Methods:

  • Neurophysiological assessment of perceptual processing in humans.
  • Evoked cortical potentials to target finger stimuli.
  • Analysis of electrogenesis in parietal and prefrontal cortices.
  • Measurement of 40 Hz oscillations synchrony between cortical areas.

Main Results:

  • Strong enhancement of short-latency cortical potentials for attended stimuli.
  • Potentiation of cognitive representations in the primary parietal cortex.
  • Enhanced electrogenesis in dorsolateral prefrontal cortex (approx. 80 msec latency).
  • Functional binding revealed by transient 40 Hz oscillation synchrony between parietal and prefrontal cortices.

Conclusions:

  • Re-entrant interactions at 40 Hz are essential for conscious brain mechanisms.
  • These mechanisms facilitate object identification and motor response decisions.
  • Conscious processing involves coordinated activity between parietal and prefrontal cortices.

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