Once there is a standard of healthy patterns to refer to, it then becomes possible to recognize abnormal brain waves that signal something going awry.

Though theoutput of the electrodes is a set of crude brain waves, enough is nowknown about the healthy patterns of these waves for changes in them tobe used to diagnose unhealthy abnormalities.

Though the output of the electrodes is a set of crude brain waves, enough is now known about the healthy patterns of these waves for changes in them to be used to diagnose unhealthy abnormalities.