If you watch the oscilloscope, you’ll get comfortable reading what EEG activity looks like: it is not generally repetitive or overly consistent. When all the wave forms are roughly the same height, instead of taller and shorter, that’s probably not brain. If the width of the waves are very consistent rather than shifting to wider (slower) and narrower (faster) patterns, again, that’s probably something mechanical rather than organic. Sudden spikes, especially when they are repetitive, probably also indicate a problem. […]