What is the morphology of EEG mu waves?

Updated: Oct 09, 2019
  • Author: Roy Sucholeiki, MD; Chief Editor: Selim R Benbadis, MD  more...
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Example of mu waveforms. Example of mu waveforms.

See the list below:

  • Mu waves are runs of rhythmic activity that have a specific shape. They are rounded in one direction with a sharp side in the other direction.

  • Frequency is one half of the fast (beta) activity.

  • Mu waves disappear with motor acts of the contralateral hand or arm.

  • Unlike alpha activity, they are not blocked by eye opening.

  • They often are asymmetric.

  • Mu waves are seen best when the cortex is exposed or if bone defects (eg, postsurgical) are present in the skull.

  • They tend to be more evident over the motor cortex and in the parasagittal regions.

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