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Related Experiment Videos

P300 latency indexes nitrogen narcosis.

B Fowler1, J Pogue, G Porlier

  • 1Department of Physical Education, York University, Ont, Canada.

Electroencephalography and Clinical Neurophysiology
|March 1, 1990
PubMed
Summary

Nitrogen narcosis slows reaction time and P300 latency, but not amplitude, in divers. This effect is dose-related with hyperbaric air, supporting the slowed processing model of inert gas narcosis.

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Reply from the authors.

British journal of anaesthesia·2014

Area of Science:

  • Neuroscience
  • Diving Physiology
  • Cognitive Psychology

Background:

  • Nitrogen narcosis is a common risk for divers breathing compressed air at depth.
  • Understanding the neurophysiological effects of nitrogen narcosis is crucial for diver safety.
  • Previous research suggests cognitive impairments, but specific mechanisms require further investigation.

Purpose of the Study:

  • To investigate the impact of nitrogen narcosis on reaction time (RT) and P300 event-related potentials.
  • To determine if P300 latency and amplitude are sensitive indicators of nitrogen narcosis.
  • To explore the dose-response relationship between hyperbaric air exposure and neurophysiological changes.

Main Methods:

  • Ten subjects were exposed to hyperbaric conditions (6.5, 8.3, 10 ATA) breathing either air or heliox.
  • Participants performed a visual oddball task, responding to presented names under controlled accuracy.
  • Single-trial analysis was used to assess reaction time (RT) and P300 latency and amplitude.

Main Results:

  • Reaction time and P300 latency were significantly slowed by hyperbaric air in a dose-related manner.
  • Heliox (a non-narcotic gas mixture) did not produce these effects.
  • A clear dose-response relationship for P300 amplitude was not established.

Conclusions:

  • P300 latency serves as a reliable index for nitrogen narcosis.
  • The findings support the slowed processing model of inert gas narcosis.
  • This research provides neurophysiological evidence for the cognitive effects of nitrogen narcosis in divers.

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