This image demonstrates a 30-second recording (Compumedics) of stage wake with eyes closed, notable for the alpha activity occurring the occipital leads (labeled O2-M1 and O1-M2). The top two leads represent the eyes (right and left), the next lead is the chin, then the following six leads are EEG (right and left frontal, central, and occipital), ECG with heart rate below (R-R), and the leg EMG lead.
