Cerebellar Modulation of Cognition in Psychosis

This study is exploring how a part of the brain called the cerebellum affects thinking and memory in people with psychotic disorders like schizophrenia. Researchers will use a brain stimulation technique (rTMS) and brain scans (MRI) to better understand this connection. **You may be eligible if...** - You are between 18 and 55 years old - You have been diagnosed with schizophrenia, schizoaffective disorder, or bipolar disorder type I - You read, speak, and understand English - You are in stable outpatient treatment with no hospitalizations or medication changes in the past 30 days **You may NOT be eligible if...** - You have epilepsy or a history of multiple seizures - You have metal implants, a pacemaker, a deep brain stimulator, or other implanted devices - You have a progressive neurological disease like MS or Parkinson's - You have had a serious head injury with prolonged loss of consciousness - You have a moderate substance use disorder in the past month - You are pregnant Talk to your doctor to see if this trial is right for you.