The LENS, or Low Energy Neurofeedback System, is related to traditional neurofeedback but differs in the type and nature of the “feedback” component. Whereas traditional neurofeedback is based on operant conditioning of the EEG, LENS uses a very low power electromagnetic field, like the ones that surround digital watches and wires in the wall, to carry feedback to the person receiving it. The feedback travels down the same wires carrying the brain waves to the amplifier and computer. Although the feedback signal is weak, it produces a measurable change in the brainwaves without conscious effort from the individual receiving the feedback.
The LENS software allows the EEG signals that are recorded at the scalp to control the feedback. LENS uses a feedback frequency that is different from, but correlates with, the dominant brainwave frequency. When exposed to this feedback frequency, the EEG amplitude distribution changes in power. Most of the time the brain waves reduce in power; but at times they also increase in power. In either case the result is a changed brainwave state, and much greater ability for the brain to regulate itself.
LENS maps are topographical diagrams of brain function based on the subject’s change in EEG pattern in response to low levels of radio frequency energy at various frequencies offset from the dominant frequency of EEG. The maps reveal patterns of EEG amplitude and variability that are correlated with head injury, physical and emotional trauma, and a variety of physical causes of brain dysregulation. Note that they are based on a different approach than QEEG based maps, in that they are based on reaction to stimulation rather than basal activity of the brain. Nonetheless, when the two approaches show convergent findings, it reinforces the conclusions drawn from the overall mapping study significantly.