Mandal, P. K., Banerjee, A., Tripathi, M., & Sharma, A. (2018). A comprehensive review of magnetoencephalography (MEG) studies for brain functionality in healthy aging and Alzheimer's disease (AD). Frontiers in computational neuroscience, 12.
I believe that we don't need machine learning to distinguish healthy subjects vs patients, especially in neuropsychiatric disorders, but it is a promising tool to predict the course of a disorder, or to predict the response to treatment to neuropsychiatric disorders.