Disorders of thought possession in schizophrenia are sometimes called thought alienation. The patient has the experience that his thoughts are under the control of an outside agency or that others are participating in his thinking.
Thought insertion The patient believes that thoughts that are not his own are being put into his mind by an external agency.
Thought withdrawal The patient believes that thoughts are being removed from his mind by an external agency.
Thought broadcasting The patient believes that his thoughts are being 'read' by others, as if they were being broadcast.
Thought blocking Involves a sudden interruption of the train of thought, before it is completed, leaving a 'blank'. The patient suddenly stops talking and cannot recall what he has been saying or thinking.
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