Here is a person engaging in Neurofeedback.  Placed on each ear lobe  is a sensor,  and another sensor is placed on the  head at the site that is determined to be best for the outcome. She has her sensor placed on what we call Cz site.

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Below is the computer program she is using to train her dys-regulated Theta and Beta brainwaves .  She is being rewarded by receiving points for each time she reaches her yellow threshold marker.