Visualization of sensorimotor areas involved in preparation for hand movement based on classification of μ and central β rhythms in single EEG trials in man
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Abstract
It is well known that mu and central beta rhythms start to desynchronize > 1 s before
active hand or finger movement. To investigate whether the same cortical areas are
involved in desynchronization of mu and central beta rhythms, 56-channel EEG recordings
were made during right- and left-finger flexions in three normal subjects. The event-related
desynchronization (ERD) was quantified in single EEG trials and classified by the
Distinction Sensitive Learning Vector Quantization (DSLVQ) algorithm. This DSLVQ selects
the most relevant features (electrode positions) for discrimination between the preparatory
state for left- and right-finger movements. It was found that the most important electrode
positions were close to the primary hand area. However, in all three subjects the
focus of the central beta ERD was slightly anterior to the focus of mu desynchronization.
This can be interpreted that different neural networks are involved in the generation
of mu and central beta rhythms.