ECG produces small spikes that are recurrent and are especially evident in the monopolar montages. Pulse artifacts occur with recurrent motion of electrodes sitting over a bounding pulse, which alters the contact with the skin. This causes a rhythmic disturbance that is synchronous with the heart but rounded rather than sharp in form. Tremor and movement of the head or body may cause electrodes to move. Electrode pops or movements can produce sudden, recurrent, or continuous electrical waves.
Electrical fields result from electrical devices and televisions.
Different frequencies sometimes add to or cancel each other, creating odd waveforms or fluctuations of waveforms. Pseudospikes or pseudoslow waves may be seen with intermixing of waves. Many fascinating patterns have been generated by mixing artificially created computer-generated frequencies. These waveforms have the significance of the basic waveforms that underlie the patterns. Example of mu waveforms.