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on 8/5/88 11:48 AM, Rod Linn at diverod@ms*.co* wrote: > On this list I have read references to a chess playing study done where one > participant was in a chamber and the other was outside the chamber. Can anyone > tell me where I can find a paper on this or at least more information. If you search the archives here and on Quest you should find some posts about two divers (lets call them Mick and Steve) Whilst on the surface Mick beats Steve at chess EVERY time, no contest. But, you give MIck air and send him down to 15m (45ft) and give Steve a good trimix and send him down with a chess set. Steve beats Mick EVERY time. I guess that's indicative of how narcosis begins by affecting the higher brain function first, you don't notice there's a problem until something goes wrong. Of course it starts as soon as you get in the water, just not usually noticeable, or much of an impediment till around 30m, but clearly it doesn't just 'kick in' at a certain depth. The other aspect that George keeps hammering is the residual, ongoing microcirculatory damage that high PN2 causes. This is more concerning to me than the narcosis which is manageable at shallower depths, you just can't duck stuff like bone necrosis and by the time you find out, you're screwed. > I have a friend that just completed an extended range deep air course where he > was taught that "with training" you can learn to overcome Narcosis and it's > effect on task loading. He made repetitive dives to 200 feet on air using > independent doubles an switching to EAN40 at 160 fet for an ascent/deco gas. Obviously your friend is being 'taught' by idiots and we all know who it is from your post. Can you get him a copy of the GUE Fundamentals book, the Tech Manual PDF and have a serious talk with him? Maybe he can take a GUE course. Hopefully the reference to EAN40 at 48m is a typo ... even TDI is not that stupid surely ? > He truly belives that he is one of the lucky ones that doesn't get narcosis. Then your friend is in the right company. A friend of mine is PADI OW Instructor. He claims that he NEVER gets narced. He reckons that the regular diving he does has inured him to narcosis. Of course he's being fooled by the highly repetitive type of diving he is doing: shallow-medium depths, doing the same training routines every dive. The routine lulls him into thinking he is unimpaired. He should know better, but then look at where all his information comes from. About 5 years ago (when I knew no better) I went to the Coolidge with him. We did the whole thing an air (as you do) and he claims to this day that even at 60M+ on air he was not the slightest bit narced. He is completely full of shit of course, but you can not tell him. Needless to say that while he is an old friend and a funny guy, I don't dive with him at all. regards dean laffan real world productions melbourne, australia ph +613-9419-3966 Mobile 0418-525-315 -- 'To deep air dive is to be stupid. It's foolish. It just makes no sense. Deep air diving is absolutely bullshit, man. -Billy Deans -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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