Fig 1 On Channel 2 it may be evident that there is a beta like rhythm after the event marker on Channel 4 which marks the instruction to repeat the alphabet covertly. Note that the beta rhythm is not evident on Channel 3 which shows a lot of alpha frequency brain waves. Channel 2 is from the left hemisphere and Channel 3 is from the right. Channel 1 is a 1 second timer. We don't want the EEG to be contaminated by speech.
All movement is to be kept to a minimum.
Mark the record . Mark the record. Have the participant repeat the alphabet covertly Imagery instructions. Mark the record. Fig 2 Stimulus for mental rotation task.