Is there a good measure of mental energy, focus and alertness? 1-3 variables that are as easy to measure as heart rate?
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beyond reaction time www2.psychology.uiowa.edu/faculty/mordko some people think temperature is a proxy ncbi.nlm.nih.gov/pubmed/12388468
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I've been told that how many times you can tap the space bar in a set period is a good test of alertness, but I can't find any sources.
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heart rate variability, 2nd order effect might be more relevant.






