Randy has been experiencing several disturbing symptoms over the last year including: muscle weakness, slow reaction time, visual perception issues, seizures, hearing loss, weight gain, a general sense of pain, and delusions.

explain why his doctors might be concerned with the following when making their diagnosis:
neurotransmitters
hormones
myelin sheath
occipital lobe
temporal lobe
describe how each of the following brain scanning techniques would aid the doctors in making their diagnosis of these symptoms:
pet scan
fmri
eeg