As a high school student I have been especially nervous and sensitive to my body condition’s influence on my test performance.I often feel sleepy and a little bit unconscious taking my tests.I suspect it has something to do with my water intake quantity and frequency as I sometimes forget to drink so maybe dehydration is the main cause.However I have also learnt that antidiuretic hormone stimulates neuro activities so I am curious about how much water intake exactly has the best effect on my study.I’m gonna find it out.

# Tracking Water Intake's influence on test(maths) performance

I plan to set 3 independent variables:the total quantity per day,the frequency and the proportion of water I take in before noon and after noon.The dependent variable I will be tracking will be the time I spend on a standardized maths test paper and the accuracy rate I get.

So there will be three period of my self observation.For the first week I will drink 2.5L a day.The second week 2L and the third 1.5L.For each period,from Mon to Wed 5 times a day,Thu to Sun 10 times a day-all averagely distributed in daytime.That’s the tentative plan and it will start tomorrow.

Just a note that I’ve never seen a project tracking water and cognitive performance before - it’s a reasonable theory and interested to see the effects.

Very neat idea. I’m also interested to see what you find. One note of caution: a while back, I tried evaluating the effect of a few interventions on cognitive performance using a timed math test. The problem I ran into was that I got better at the math test with practice and that effect was so large compared with any improvement from the intervention that I couldn’t interpret the results. To detect and hopefully avoid this effect, you might want to re-order your weeks (so that amount of water isn’t decreasing with time) and add some repeats. Maybe 2.5, 1.5, 2, 2.5L or similar?

Hi Steven, I remember Seth Roberts reporting that the reason he used a simple arithmetic test was that the practice effect disappeared relatively quickly. Since his question was “what can I do to improve my cognition” he was looking for outliers that couldn’t be explained by practice (sudden improvements after practice effects leveled off).

Model practice effect as wide rolling mean or simple polynomial. Subtract from results. Then “rate of practice effect” is a concern so do reorder and repeat.