Neuropsychological approach to elucidating delusion and psychotic symptoms

Motoichiro Kato

Research output: Contribution to journalArticle

Abstract

Neuropsychological symptom-oriented approach is a critical method to elucidate delusion and psychotic symptoms in patients with focal brain damages and schizophrenia. In Capgras delusion (CD), the delusional misidentification of familiar people disguised as others, the patients with right amygdala damage and bilateral ventromedial prefrontal lesions have a deficient or reduced emotional valence of the person with intact configurational processes of the face. Reduplicative paramnesia (RP) is a specific phenomenon characterized by subjective certainty that a familiar place or person has been duplicated. Clinical evidences indicated that the patient with RP following right prefrontal damages showed the lack of emotional valence for the present hospital. This abnormal sense of familiarity triggered the deficits of the orientation of self to the outside world, that is, double orientation, resulting in the development of geographical reduplicative paramnesia. In line with the pathogenesis of CD and RP after brain damages, the delusion in schizophrenia may have a germ as developmental origins, which include the aberrant or salient perceptual experiences and abnormal sense of agency, and might be further aggravated by the impairment of causal reasoning process such as the jumping-to-conclusions bias.

Original languageEnglish
Pages (from-to)1379-1381
Number of pages3
JournalClinical Neurology
Volume52
Issue number11
DOIs
Publication statusPublished - 2012 Dec 1

Keywords

  • Capgras syndrome
  • Delusion
  • Emotion
  • Neuropsychologgy
  • Reduplicative paramnesia

ASJC Scopus subject areas

  • Clinical Neurology

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