In Reply to: Re: Deep Air and Adaptation posted by Diver Z on June 30, 2006 at 09:19:43:

Good question. Another good question would be if yes then why? Intuitively the answer to question 1 should be yes, but that's just my intuition. I recall reading where different divers had different scores on various tests under similar conditions but don't recall whether these results carried over from baseline (surface) differences or whether they were determined to derive from varying levels of impairment at depth. Another interesting question is whether the same diver exhibits varying psychomotor impairment levels across dives or whether it is simply a perceptual variability that creates the idea that narcosis effects change from dive to dive.

As for 2, effecting the same part of the brain could be true without replicating with precision the same symptoms. Effects of nitrous at the surface can be pretty powerful. Switching from trimix to air at 200 is like getting hit by a piano. That dosn't mean they're the same.