Mu wave

It has been suggested that Mu rhythm be merged into this article or section. (Discuss) Proposed since August 2011.

Mu waves, also known as the comb or wicket rhythm, are electromagnetic oscillations in the frequency range of 8–13 Hz and appear in bursts of at 9 – 11 Hz. Mu wave patterns arise from synchronous and coherent (in phase/constructive) electrical activity of large groups of neurons in the human brain. This wave activity appears to be associated with the motor cortex (central scalp), and is diminished with movement or an intent to move, or when others are observed performing actions. Researchers such as V.S. Ramachandran have suggested that EEG oscillations in the mu wave range reflect mirror neuron activity.^[1] Recently, based on the conflicting evidence presented by mu-wave suppression experiments, Patricia Churchland has cautioned that "studies indicate that mu-suppression turns out to be the same in both high-functioning autism spectrum disorder (ASD) subjects and healthy controls, hence disconfirming the hypothesis that mu-suppression is an index of mirror neuron activity. Alternately, if it is such an index, then disconfirming the hypothesis that mirror neuron activity is abnormal in ASD subjects."^[2] Mu waves are commonly detected by electroencephalography (EEG) or magnetoencephalography (MEG). The mu wave is an alpha wave like variant.

History

Mu waves have been studied since the 1930s, and are referred to as the wicket rhythm because the rounded EEG waves resemble croquet wickets. In the 1950s, Gian Emilio Chatrian showed that the amplitude of mu waves could be suppressed by physical movements. Later studies showed that the simple intent to move, or certain other visual or mental tasks also can suppress mu wave amplitude.^{[citation needed]}

Neurofeedback

EEG neurofeedback training (often called neurotherapy or neurofeedback) is a method that enables persons to alter their brain waves via feedback regarding their present state. Research has suggested that a dysfunctional mirror neuron system may explain the pathology observed in autism spectrum disorders (ASD). Mirror neurons and mu waves may play a critical role in the ability to understand and imitate others' behaviors. Early research results, on enhancing mu wave activity through biofeedback a therapy for autism, have been promising thus far.^{[citation needed]}

See also

• Electroencephalography
• Sensorimotor rhythm

Other brain waves

• Delta wave – (0.1–4 Hz)
• Theta wave – (4–7 Hz)
• Alpha wave – (8–12 Hz)
• Beta wave – (12–30 Hz)
• Gamma wave – (25–100 Hz)

References

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