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Rod Nairne Wrote
>    The 1991 NOAA tests had some interesting results. Apparently,  a 
>convulsion occured on mixed gas after 40mins at a po2 of 1.6.  For pure
>oxygen, the lowest po2 to produce a convultion was 1.76 ata.
>
>One explanation is that mixed gas has a higher breathing resistance due
>to the greater depths in which it is used. However, there is probably
>more to it than that, and generally speaking high po2's are less likely
>to produce symptoms if you are breathing pure 02.
>...

Chances are when you are breathing O2 you are hanging/resting and with
your bottom mix you would be doing work.  O2 toxicity is directly related
to your level of activity.

Safe Dive, Ed.

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