Acting on delusion and delusional inconsequentiality: A review

Area of Science:

• Psychopathology
• Phenomenological Psychiatry
• Philosophy of Delusion

Background:

• Twentieth-century psychopathologists Eugen Bleuler and Karl Jaspers noted patients' actions often diverge from their delusions.
• This observation highlights a gap in understanding the link between delusional ideation and behavior.

Purpose of the Study:

• To critically review psychopathological literature concerning the influence of delusional ideation on behavior.
• To explore the concept of 'delusional inconsequentiality' in understanding psychosis.

Main Methods:

• Critical review of existing psychopathological literature.
• Analysis of phenomenological psychiatry and analytical philosophy perspectives on delusions.
• Examination of empirical studies on acting on delusions over the past three decades.

Main Results:

• Phenomenological psychiatry emphasizes disorders of self-experience, while philosophy of delusion debates its psychological status.
• Empirical studies on acting on delusions, particularly violent or safety-seeking behaviors, indicate motivation by emotional outbursts (anger, fear) rather than delusional content.
• These findings implicitly confirm delusional inconsequentiality.

Conclusions:

• Delusional inconsequentiality can be elucidated by conceptual research but requires clearer identification within psychopathological processes.
• Empirical evidence supports delusional inconsequentiality by highlighting affectivity's role over beliefs in delusional actions.
• Delusional inconsequentiality is proposed as a valuable concept for future psychopathology and clinical practice research.