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There is an interesting article in the "Undersea and Hyperbaric Medecine" journal, vol. 22, no. 1, 1995. Kevin Hamilton, M.-F. Laliberte and B. Fowler did a research on dissociation of the behavioral and subjective components of nitrogen narcosis and diver adaptation. This study was conducted at the Defense and Civil Institute of Environmental Medecine (DCIEM). They investigated adaptation in 11 experienced divers in a hyperbaric chamber to a depth of 54.6 msw. One dive was conducted per day, for 5 consecutive days. They found that the global estimate of narcosis (subjective evaluation - how we feel) showed adaptation on day 3. On the other hand, the behavioral component (how we react) did not show any adaptation. This seems to provide us with a false sense of security. The global estimate was made of subjective evaluation of several adjectives (able to concentrate, able to think clearly, fuzzy, etc). The study revealed that judgments about work capability can be differentiated from judgments about body sensations (work capability judgment showed few signs of adaptation). I think that nitrogen narcosis is the subject of few scientific researches. Much more research would be required before we have a good understanding about adaptation. PS: The article was obtained from Dr. Kevin Hamilton of BC Research (Vancouver, Canada). Michel Therrien m.therrien@ne*.qc*.ca*
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