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A resistance to counter-arguments and the adherence to thin evidence are both good indicators of a delusional belief, explains Professor Paul Bebbington (Ïã¸ÛÁùºÏ²ÊÖÐÌØÍø Queen Square Institute of Neurology).

Listen: BBC Radio 4’s ‘A History of Delusions’ (from 14 mins 58 secs)