Is there a good measure of mental energy, focus and alertness? 1-3 variables that are as easy to measure as heart rate?
Replying to @vgr
@vgr beyond reaction time http://www2.psychology.uiowa.edu/faculty/mordkoff/pdfs%5CMatchock%20&%20Mordkoff%202007%20(EBR%20178).pdf … some people think temperature is a proxy http://www.ncbi.nlm.nih.gov/pubmed/12388468
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