Patients with schizophrenia may believe that their television set is speaking to them personally or they may have hallucinations of visions or voices they experience as real. They may have seriously disordered and disorganized thoughts and their speech may skip in a disorganized way from topic to topic, stringing together unrelated concepts. Patients are often socially isolated and withdrawn, barely able to function in the world, have little expression of emotional responses to social situations, and have severe difficulty in abstract thinking.