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I did not know this but I guess EEG does help determine if someone has MS. It makes sense. I wonder if you have to have lesions in the brain in order for the EEG to pick it up? I would think so. I think you had said that your husband's MRI was clear.
EEG has been used in MS and does show differences but only when there is significant lesion load / cognitive impairment. It wouldn't be sensitive enough to make a diagnosis, especially if the diagnosis cannot be confirmed by MRI.