No, you can't. Because a reading that _isn't_ medical-grade is dominated by *noise*, not by the user's emotional state.
The game you played almost certainly gave readings as crappy as the ones I described above, with results that were a hair's-breadth away from random (and probably dominated by how much each person was sweating; skin conductivity is much easier to measure than surface electrical activity).
No, you can't. Because a reading that _isn't_ medical-grade is dominated by *noise*, not by the user's emotional state.
The game you played almost certainly gave readings as crappy as the ones I described above, with results that were a hair's-breadth away from random (and probably dominated by how much each person was sweating; skin conductivity is much easier to measure than surface electrical activity).