Temporary impairment

It’s easy to find articles on the long term impairment to IQ due to fetal alcohol syndrome and other causes, yet terribly difficult to find anything on the much more common-place phenomenon of temporary impairment. I think that it would be very useful to know the number of standard deviations by which a given level blood alcohol, sleep deprivation, or other impairment alters IQ, reaction time, etc. Does anyone here have any idea where this sort of research is published, or if it isn’t published, why it isn’t? Government resistance to research facilitating the direct comparison of the hazards of different drugs is an obvious reason, but doesn’t seem sufficient.

For that matter, any thoughts on why the magnitude of the cognitive benefits of aderall, ritalin, modafinal, caffeine, and the like are so rarely quantified?

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