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Schizophrenic refers to a man with a mental disorder characterized by abnormalities in the perception or expression of reality.
distortions in perception may affect all five senses, including sight, hearing, taste, smell and touch,
but most commonly manifest as auditory hallucinations just like what aquadwarf just said you can hear music playing though there's really no music or no one is beside you...
paranoid or bizarre delusions
and also it can be refer to a man with disorganized speech and thinking with significant social or occupational dysfunction.