HPN Ultra Low Power Neurofeedback is a type of brainwave based biofeedback  that has shown promise of clinical efficacy in addressing the symptoms associated with Traumatic Brain Injury (TBI), Post-Concussive Syndrome, Post-Traumatic Stress Disorder (PTSD), Anxiety, Depression,  “brain-fog,”  and attention deficit disorders.

HPN measures and tracks the electrical activity of the brain (brainwaves) and then sends directly back to the brain a very weak, imperceptible signal containing information based on the just preceding brainwave activity.  The power in the signal is estimated to be about 3 p W (picowatts).  Although the power in this signal is amazingly small, the brain appears to be able to adjust its own functioning based on this feedback.