The alpha and beta ERD bands are an electrophysiological correlate of an activated cortical network, preparation for information processing, and increased excitability of cortical neurons. The beta ERD is elicited by preparation, execution, and imagining a motor act [59-61], and mu and central beta activity may be indicative of the activity state of neural networks in the somatosensory cortex [62]. Increased beta activity in patients may be related to dysfunction of a neural network.
