Sensorimotor rhythm

The Sensory Motor Rhythm (SMR) is also called mu rhythm (find a more detailed article there). It is a 12 - 15 Hz oscillatory spindle rhythm of the EEG, MEG, and ECoG that appears over the sensorimotor cortex.

It is associated with a reduction of motor output and sensory input. It is thought by some that people with learning disabilities, ADHD, epilepsy, and autism may benefit from an increase in SMR activity via biofeedback/neurofeedback. Neurofeedback practitioners believe - and have produced experimental evidence to back up their controversial claims - that regulation of the SMR can be learned. The existence of the SMR spindle is not well known outside of neurofeedback circles.

Phenomenologically, when a person is producing high amounts of SMR they are in a calm and alert state of consciousness.