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JenniferRM comments on Alternate Sleep Schedules - Less Wrong Discussion
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Reaction times can do amazing things when you get clever.
Relatively simple reaction times are reported to correlate g somewhere around 0.3 to 0.5 depending on details, with faster times associated with higher IQ. Brutally simple procedure: hold a ruler up vertically and have it dropped by an unpredictable process while holding fingers in a position to pinch it and stop the fall after you detect that it has begun to fall. Record how many centimeters it falls in a spreadsheet. If the number gets big, something is probably going wrong with your brain.
Having a friend on hand to drop the ruler is a big help. Also, for any drinkers out there, try this while sober and then after having some drinks (tested one at a time, because you'll be surprised how quickly results show up).