The Mu Rhythm in Current Research: Theoretical and Methodological Aspects

摘要

The mu rhythm is of interest in research into a wide range of processes, from motor functions to language processes and emotions. This rhythm includes at least two nonharmonic components in the α (8–13 Hz) and β (15–25 Hz) frequency ranges, with different functional roles, indicating the need for them to be studied independently. Overlap with α activity requires the effects of changes in attention to be monitored, with consideration of electrical activity not confined to the central leads, and also the application of mathematical methods of discriminating the mu and α rhythms. Mu rhythm suppression has been proposed as an index of arousal for the mirror neuron system, which has provoked much discussion and many studies, including those linked with the potential mixing of mirror neuron system activity and attention system activity. This review addresses current research in the context of these three aspects and includes results from the authors’ own research.