You want to test a patient for perseveration during a cognitive assessment. Before revealing the answer, decide how you would go about it.

Ask a rapid sequence of clearly different questions, changing topic deliberately between them, and listen for whether an answer from an earlier question inappropriately reappears in the response to a later, unrelated one. Since perseveration tends to worsen as the difficulty of the task increases, include some questions that are genuinely more taxing, not only simple ones, to give the phenomenon the best chance of appearing if present. Note whether the patient appears to notice the repetition themselves and attempts, with limited success, to correct it, since this is itself part of the recognised picture. Given its strong association with organic brain disease, a positive finding should prompt appropriate further cognitive and, where indicated, neurological assessment.