Double bookkeeping in schizophrenia: a literature review

Introduction: Schizophrenia spectrum disorders are characterized by profound disturbances in subjective experience. “Double bookkeeping,” a concept introduced by Eugen Bleuler, describes a core feature in which a psychotic reality coexists alongside a shared consensual reality, even when the two appear mutually exclusive. Individuals may therefore function in everyday life while simultaneously maintaining a parallel private experiential world. This challenges simplified notions of psychosis as a complete break with reality and has been discussed since Bleuler and in later phenomenological psychiatry.

Aim(s) of the study: This study reviews the existing literature on double bookkeeping in schizophrenia. It aims to explore experiential structure, development, and clinical implications of this dual-reality phenomenon.

Methods: A literature review was conducted, including peer-reviewed articles, theoretical papers, and phenomenological studies. Databases such as PubMed and Scopus were searched using the keywords “double bookkeeping,” “dual reality,” “schizophrenia,” “psychosis”, “phenomenology.”

Results: Literature shows that double bookkeeping is more common in chronic or partially remitted phases of schizophrenia and less evident in acute psychosis. It has been described as a form of functional adaptation, allowing individuals to preserve social functioning while privately maintaining delusional beliefs. Phenomenologically, this reflects a partial dissociation between layers of consciousness, in which the patient does not fully integrate psychotic and consensual realities into a single coherent framework. Individuals may retain implicit awareness of the discrepancy between realities without abandoning delusional convictions. Cognitive models explain this phenomenon in terms of preserved metacognitive abilities and compartmentalization of belief systems. In contrast, phenomenological approaches emphasize a more fundamental alteration in the structure of experience, particularly in the sense of selfhood, embodiment, and world engagement, suggesting a fragmentation in the constitution of reality itself, rather than a simple belief inconsistency. A recent empirical-phenomenological study of 25 individuals supports these findings. Twenty-four participants reported persistent dual realities. Most perceived the psychotic reality as more meaningful or authentic, sometimes with metaphysical significance. Separation between realities was generally maintained, with occasional overlap during acute episodes. This dual structure often emerged in adolescence and was associated with alienation, derealization, and self-fragmentation. Participants rarely conceptualized their condition as an illness, and psychotic experiences were often integrated into personal identity. Even during remission, their subjective significance persisted. Difficulties in verbal expression frequently delayed clinical disclosure.

Conclusions: The coexistence of parallel experiential realities appears to be a core feature of schizophrenia spectrum disorders, reflecting a reorganization of subjectivity rather than simple cognitive distortion. This challenges models that define psychosis solely in terms of false beliefs or loss of reality contact, instead highlighting multiple partially independent experiential frameworks. Clinically, this has important implications for insight, adherence, and functioning. Greater attention to patients’ lived experience may improve diagnosis and therapeutic engagement. Future research should integrate phenomenological, cognitive, and neurobiological perspectives to clarify the mechanisms underlying this dual structure of experience in psychotic disorders.

References

1. Bleuler, E., 1950. Dementia praecox or the group of schizophrenias (trans. Zinkin, J., Lewis, NDC). International University Press, New York.
2. Porcher, J.E., 2019. Double bookkeeping and doxasticism about delusion. PPP 26, 111–119.
3. Stephensen, H., Urfer-Parnas, A., Parnas, J., n.d. Double bookkeeping in schizophrenia spectrum disorder: an empirical-phenomenological study. Psychopathology.