They may seem strange and their behaviour could appear bizarre. Hallucinations May see, hear, feel or smell something that is not there. Voices are commonly heard and may instruct the person to act. Brain registers information as if it is real. Delusions Mistaken belief of persecution, guilt or grandeur.
Delusion often persists despite being presented with logic.
May feel thoughts are being controlled by others, being broadcast in public or believe they have extraordinary powers. Thought Disorder Speech is disconnected, illogical and jumbled. Causes There are a number of theories about what causes schizophrenia. Schizophrenia tends to run in families. Generally though, a range of factors have to be present for schizophrenia to develop.