You're not trying to get a medical-standard reading. You just need a rough measurement. For something like this you can have a simple device. I went to a science centre where they had a game where you would try reducing brain activity more than your opponent to win the game. It only had a headband with a detector on.
"If all mankind minus one, were of one opinion, and only one person were of the contrary opinion, mankind would be no more justified in silencing that one person, than he, if he had the power, would be justified in silencing mankind."
~John Stuart Mill~
You're not trying to get a medical-standard reading. You just need a rough measurement. For something like this you can have a simple device. I went to a science centre where they had a game where you would try reducing brain activity more than your opponent to win the game. It only had a headband with a detector on.
"If all mankind minus one, were of one opinion, and only one person were of the contrary opinion, mankind would be no more justified in silencing that one person, than he, if he had the power, would be justified in silencing mankind."
~John Stuart Mill~