it can detect predispositions to development of psychological disorders
detect mental illnesses, MRI scans reliable & consistently shows structure, MRI of adolescents who are high risk of developing schizo, consistently show structural & functioning abnormalities, early interventions (drug therapy) prevent/delay on set psychosis
WIDER READING - DBS (deep brain stimulation) used for treating parkinsons & depression = improve quality of life
benefits > costs if we have evidence for a physical/psychological basis for mental illness = helps reduce stigmatation