The Low Energy Neurofeedback System (LENS) was developed in the early 1990s by a California psychologist named Len Ochs. LENS is a form of EEG Biofeedback. In LENS, a person is connected to an electroencephalograph (EEG), an electronic monitoring device that measures and monitors brain activity with sensing devices (electrodes) placed on the individual's scalp. These brainwaves are then converted into an electromagnetic radio wave signal that is fed back to the brain for a fraction of a second.
A 2006 study conducted at the University of Utah suggested that LENS could be beneficial for treating animals anxiety disorders.