Deficits in executive and memory processes in delusional disorder: a case-control study.

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Psychology

Background:

• Delusional disorder has been historically viewed as a psychotic syndrome without cognitive deterioration.
• Empirical research on executive functions and memory in delusional disorder is limited.

Purpose of the Study:

• To investigate executive function components (flexibility, impulsivity, updating) and memory processes in patients with delusional disorder.
• To compare cognitive performance in delusional disorder patients against healthy controls.

Main Methods:

• A cohort of 86 patients with delusional disorder and 343 healthy controls underwent a comprehensive neuropsychological assessment.
• Tests included the Trail Making Test, Wisconsin Card Sorting Test, Colour-Word Stroop Test, and Complutense Verbal Learning Test (TAVEC).

Main Results:

• Patients with delusional disorder demonstrated significantly poorer performance across most cognitive tests compared to controls.
• Deficits were observed in executive functions (flexibility, impulsivity, updating) and various memory processes (recall, learning, recognition).
• These cognitive impairments remained significant after controlling for demographic and premorbid intellectual factors.

Conclusions:

• The findings contradict the traditional assumption that patients with delusional disorder are cognitively intact.
• This study underscores the presence of cognitive deficits in delusional disorder, necessitating a re-evaluation of its clinical profile.