Roz Picard's lab at MIT did this amazing experiment once where they put basically a head GoPro on a subject and GSR to measure engagement
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GSR = galvanic skin resistance sensor (basically: you sweat an otherwise undetectable amount when engaging things happen, & it's conductive)
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I'd like to see films charted by audience response the way you can see the timeline of comments on SoundCloud tracks or velocity on Mashable
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