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Delusions are false ideas about oneself or one's life. People with
schizophrenia may believe they are being conspired against, or that they are
a famous or important individual. These false beliefs are held with absolute
certainty, dominating in the person's mind.

Typical experiences are of thoughts being taken out of one's head or
inserted into one's mind. These delusions can be bizarre (for example,
invisible creatures entering a room through an electrical outlet) or
non-bizarre (for example, a paranoid belief in being spied on).

Disordered Thinking
People with schizophrenia may find it difficult to think and reason clearly.
In conversation, they may jump from one topic to another without making much
sense. They also may make up their own words or sounds.

A person's speech can become incoherent because of the disjointed way in
which thoughts are processed. Some people will connect words because of
similarity of sound rather than by meaning (known as "clang" association).

Lack Of Emotional Expression
People with schizophrenia may not show the signs of normal emotion. This can
include speaking in a monotonous voice, having diminished facial
expressions, and appearing to be extremely apathetic.

Inappropriate Reactions
People with schizophrenia may react with inappropriate behavior to certain
circumstances. For example, they may laugh hysterically over a sad event.