think it is eeg

the one they wire your head up in a helmet and tell u to sleep then ask u ?s flash strobe in your face ...show u pictures

some guy is reading the brainwaves coming out on something that looks like a lie detector test from the 80s

bio feedback works .....if u get a cool person ask them for 5 10 mins when it done to play around u can trigger the needles to move using emotions