Abstract
The mu rhythm is important for studying a wide range of processes: from motor functions to language processes and emotions. It includes at least two nonharmonic components in the frequency ranges of alpha (8-13 Hz) and beta rhythms (15-25 Hz), which have different functional roles, so each of them should be studied independently.
Overlap of alpha and mu rhythm ranges requires controlling the effects of changes in attention, taking into account the electric activity not only of the central leads in the analysis of the mu rhythm, as well as applying mathematical methods to separate mu and alpha rhythms. Mu-rhythm suppression has been proposed as an index of mirror neuron system activation, which has risen a large number of controversies and studies, including related to the problem of the potential mixing of the activity of the mirror neuron system and the activity of the attention system.
In this review, we consider recent studies in the context of these three aspects, including the results of the authors' own research.