Add behavioral and/or EEG tracking
I would bet some money that (when you control for when the user switches away from the application) you could get some signal out of the delay before a user answers a question. I would even bet that it would be better than the users vote regarding how easy/hard it was.
It would be awesome to hook this up to an EEG monitor, although it is an expensive task. I might need to purchase a researcher grade Emotiv Epoch anyway, so if you want me to submit the raw data...
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Trev
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