One second sample of an EEG alpha oscillations . This rhythm occurs at frequencies similar to the<unk>  rhythm, although alpha oscillations are detected over a different part of the brain. The left motor cortex, or BA4, is highlighted in green on this left lateral view of the brain. This is the area over which<unk>  rhythms are detected bilaterally. The sensorimotor<unk>  rhythm, also known as<unk> , comb or wicket rhythms or arciform rhythms, are synchronized patterns of electrical activity involving large numbers of neurons, probably of the pyramidal type, in the part of the brain that controls voluntary movement. These patterns as measured by electroencephalography (EEG), magnetoencephalography (MEG), or electrocorticography (ECoG), repeat at a frequency of 7.5–12.5 (and primarily 9–11) Hz, and are most prominent when the body is physically at rest. Unlike the alpha<unk> , which occurs at a similar frequency over the resting visual cortex at the back of the scalp, the<unk>  rhythm is found over the motor cortex, in a band approximately from ear to ear. A person suppresses<unk>  rhythms when he or she performs a motor action or, with practice, when he or she visualizes performing a motor action. This suppression is called desynchronization of the<unk>  because EEG<unk>  forms are caused by large numbers of neurons firing in synchrony. The<unk>  rhythm is even suppressed when one observes another person performing a motor action or an abstract motion with biological characteristics. Researchers such as V. S. Ramachandran and colleagues have suggested that this is a sign that the mirror neuron system is involved in<unk>  rhythm suppression, although others disagree. The<unk>  rhythm is of interest to a variety of scholars. Scientists who study neural development are interested in the details of the development of the<unk>  rhythm in infancy and childhood and its role in learning. Since a group of researchers believe that autism spectrum disorder (ASD) is strongly influenced by an altered mirror neuron system and that<unk>  rhythm suppression is a downstream indication of mirror neuron activity, many of these scientists have kindled a more popular interest in investigating the<unk>  in people with ASD. Assorted investigators are also in the process of using<unk>  rhythms to develop a new technology: the brain–computer interface (BCI). With the emergence of BCI systems, clinicians hope to give the severely physically disabled population new methods of communication and a means to manipulate and navigate their environments.
Mu wave
U wave
Delta wave
Stimson line
Delta Wave
Sense
T wave
Lewis offset