want all the specifics, then your neurologist can
a more detailed or thorough explanation than what I know. However, if memory serves me correctly, that is the purpose of getting an EMG done.
The neurologist also performed an EEG (everything was done at the office, except the MRI, in case you are worried about how much all this will cost you...). The EEG measures electrical activity of the brain, both at rest and under stimulation.