Rachel Gunn Some postulate that for certain kinds of delusions sensory input is distorted such that the evidence available to the subject is altered and this evidence is therefore powerful enough to resist counter arguments. In this case the subject employs normal cognitive processes to explain perceptual anomalies and this results in delusion ( Maher 1974 ). If the experience of a subject provides or includes the evidence for a delusion and the experience is anomalous (outside ‘normal’ experience) then a third party cannot hope to grasp the subject’s explanation. Further, as Maher says, there is no point of intervention in any ordinary sense to dispute the subject’s delusion. If this theory holds water it is likely to only apply to a subset of delusional subjects.
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