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Updated: May 15, 2026
14:52
Recording Brain Electromagnetic Activity During the Administration of the Gaseous Anesthetic Agents Xenon and Nitrous Oxide in Healthy Volunteers
Published on: January 13, 2018
Nitrogen narcosis and emotional processing during compressed air breathing
Per Löfdahl1, Daniel Andersson, Michael Bennett
1Faculty of Medicine, Umeå University, Umeå, Sweden. per.lofdahl@gmail.com
Aviation, Space, and Environmental Medicine
|January 12, 2013
Summary
Nitrogen narcosis impairs emotional arousal responses to stimuli during deep diving, but not the ability to judge pleasantness. This finding is crucial for understanding diver safety and performance under pressure.
Area of Science:
- Physiology
- Psychology
- Hyperbaric Medicine
Background:
- Nitrogen narcosis effects on behavior, performance, and cognition are well-documented.
- Limited research exists on nitrogen narcosis's impact on emotional processing of external stimuli.
Purpose of the Study:
- To investigate the effects of nitrogen narcosis on emotional processing.
- To assess how hyperbaric conditions influence valence, arousal, and dominance ratings of visual stimuli.
Main Methods:
- 20 volunteers viewed unpleasant, neutral, and pleasant images from the International Affective Picture System (IAPS).
- Image viewing occurred at surface pressure (101.3 kPa) and hyperbaric conditions (496.4 kPa, equivalent to 39m depth).
- Participants rated images on valence, arousal, and dominance.
Main Results:
- No significant effect of pressure on valence ratings was observed.
- A significant interaction between image category and pressure was found for arousal ratings.
- Unpleasant stimuli received lower arousal ratings under hyperbaric conditions.
Conclusions:
- Divers' ability to discern pleasantness/unpleasantness remains unaffected by nitrogen narcosis.
- Nitrogen narcosis primarily impacts the arousal dimension of emotional processing.
- Even minor alterations in emotional arousal are significant for deep diving safety.
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