Should I do Padi Deep before TDI deco & Adv Nitrox

[Thalassamania]

So, you are saying that reducing the nitrogen content of your breathing gas at a particular depth has no effect on the development of narcosis. That the ONLY change that will affect cognitive function at any depth will be breathing helium (presumably heliox?). That it is therefore the presence of helium, not the absence of a particular concentration of nitrogen, that prevents a reduction in cognitive function at depth. Interesting.

diver12345 appears to bearguing based on, not even on anecdotal reports, but rather on Cathy Cush's remembrance of Bill Hamilton's musings, and despite what actual findings there are out there, that oxygen is as narcotic (or more) than nitrogen.

I wonder if this is the kind of advanced science that can be learned when space aliens abduct someone for their diabolical experiments. What objective data can you offer to support this statement?

Yes.
None.