How to make diagnosis of these symptoms using Pet scan, fMRI, and EEG? The symptoms are muscle weakness, slow reaction time, visual perception issues, seizures, hearing loss, weight gain, general sense of pain and delusions. Using the above scanning techniques, a doctor concluded that there are problems in emission of neurotransmitters and secretion of hormones as well as myelin sheath of some neurons, occipital lobe, and temporal lobe. Could you tell me how the doctor used the scanning tools to reach to his conclusion? I totally have no idea how the doctor learned that there's problem in emission of neurotransmitter by using scanning techniques.
T2 weighted MRI scans can reveal white matter lesions, so that may explain the detection of demyelination. 

Of course, that's not fMRI...