گرچه مشکل اینجاست که فقط مغز نیست که فعالیت الکتریکی دارد، بقیه بدن و محیط زیست همینطورند که شامل فعالیت الکتریکی زیادی در هر زمان میشود. 
The problem is, however, it's not just the brain that's electrically active, it's also the rest of the body as well as the environment that contains a lot of electrical activity all the time. 