Spectral Analysis of EEG Signals obtained during Mirror Therapy and Imagined Hand Movements

Mirror therapy and motor imagery training can assist in the recovery of motor function after stroke. The changes in the brain activity through mirror therapy and motor imagery training can be monitored using electroencephalogram (EEG). The effect of mirror therapy on brain activities has not been examined extensively using EEG. This study analyses the EEG signals to identify the brain status during mirror therapy and motor imagery training. The EEG signals were acquired from 32 channels. The signals were then filtered and divided into three frequency bands. Power Spectral Density was then computed and EEG signal strength was examined at every channel. Seven channels provide strong EEG signals and contain brain status information which are suitable for monitoring changes in the brain activity during mirror therapy and motor imagery training.