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A 26-year-old accountant is brought to his general practitioner by his sister. For four months he has believed that the presenter of the evening news bulletin arranges her pauses and her glances to send him personal instructions, and that the number plates on his street are chosen to tell him what to do next. He records the bulletin nightly and has stopped driving. He hears no voices, sleeps and eats normally, and his mood is unremarkable. He cannot be shifted from the belief by any argument. Which one of the following best describes his abnormal experience?
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Keep going — a set of ten like this one, one at a time.

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