Intermediate
Technical
IVT
mu rhythm
A distinctive EEG pattern of 8-13 Hz activity over sensorimotor cortex that blocks with movement or tactile stimulation.
Full Definition
Mu rhythm is a normal EEG finding consisting of arch-shaped waves in the 8-13 Hz frequency range recorded over the central regions (C3, C4) of the scalp. This rhythm is most prominent during relaxed wakefulness and characteristically disappears or attenuates when the patient moves, thinks about moving, or receives tactile stimulation. It represents idling activity of the sensorimotor cortex and must be distinguished from pathological central spikes in epilepsy patients.
Usage
Usage note: Always specify that mu rhythm blocks with movement to distinguish from pathological activity.
In Context
- "The mu rhythm was clearly visible over the right central region and promptly blocked when the patient clenched their left fist." — EEG report
Also known as
rolandic rhythm
sensorimotor rhythm
Don't confuse with
central spikes
beta activity