User Tutorial:Introduction to the Mu Rhythm
- Origin in the sensorimotor cortex
Behavioral Properties
- Amplitude modulation by intended or imagined movement
Physical Properties
- Arc-shaped, periodic wave form, corresponding to a line spectrum with a strong first harmonic
- Dipolar source character, connection with cortical surface
- Typical scalp potential distributions
BCI Construction
- By imagination of movement, a human subject can wilfully influence the amplitude of her/his mu rhythm. Continuous feedback of mu rhythm amplitude can help improve this natural ability by selective reinforcement of successful strategies.
- Much like a historic AM radio receiver, a mu rhythm BCI treats the mu rhythm as a carrier signal with information impressed on it by amplitude modulation.
- BCI operation consists of
- spatial selection (spatial filter <-> directional antenna)
- frequency selection (classifier <-> tuning wheel)
- carrier demodulation (spectral amplitude <-> rectifier diode)
Practical Aspects
- How to localize the motor cortex with the help of an EEG cap
- Suggested movement imagination