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This is downright contradictory to me. If you can't think clearly and/or can't remember your dive, I'd call that being noticeably and significantly impaired.At the depths in question, maybe it's not so much "impairment" as just wanting to be able to think that much more clearly or to be able to rememb in minute detail what you saw down there.
I'm not He certified, so I'm only using air or nitrox. I've got my own personal limits. And my limit is 30m. I've been deeper, but only under benign conditions. On a normal dive in my home waters, I can usually feel the narcosis starting to sneak up on me somewhere between 25m and 30m. I don't know if I'm particularly susceptible to narcosis, or if I've just got a sensitive radar WRT mental impairment...