Section One: Introduction

1.1 Research Background and Significance

Macro Context

For centuries, mainstream philosophy and popular psychology have treated human self-identity as a fixed, inherent, and stable truth. People widely assume that personal identity, body ownership, and behavioral agency are innate, objective features of human existence. However, modern cognitive neuroscience and experimental psychology continuously overturn this traditional cognition. A growing number of abnormal mental state observations and classic psychological experiments prove that the human sense of self is dynamic, malleable, and brain-constructed rather than static essence. This paradigm shift is reshaping modern cognition of human consciousness, personality, and individual existence.

Practical Significance

This theoretical research solves the public’s rigid misunderstanding of self-identity and provides essential cognitive basis for understanding cognitive disorders, mental illnesses, and neurological diseases. By recognizing the constructed nature of the self, ordinary people and social practitioners can build deeper empathy for individuals with altered cognition, including Alzheimer’s patients, psychosis sufferers, and people with physical dissociation disorders. It eliminates social prejudice against cognitively diverse groups and guides more inclusive social communication and medical care practices.

Theoretical Significance

Traditional self-theory overemphasizes the stability and objectivity of individual identity and ignores the neural construction mechanism of consciousness. Existing neurological research mostly discusses single abnormal symptoms but lacks a unified theoretical framework to summarize the common logic of self-fragmentation across different diseases and experiments. This study fills the theoretical gap by integrating experimental evidence and clinical phenomena, constructing a complete explanatory system of “predictive constructed self” and unifying the interpretation of normal self-perception and abnormal self-dissociation.

1.2 Core Concept Definitions

1. Constructed Self: A fragile, dynamically adjusted perceptual and narrative identity built by the human brain through predictive cognition, sensory integration, and memory splicing, rather than fixed objective reality.
2. Embodied Self-Perception: The brain’s subjective judgment of body ownership and physical boundary, formed by the integration of vision, touch, and multisensory signals, which can be dissociated and reconstructed artificially or pathologically.
3. Narrative Self-Identity: The continuous life story constructed by memory, which people rely on to confirm personal continuity; it is dissociable from the basic experiential self.
4. Cognitive Agency: The subjective sense of controlling one’s own behaviors and thoughts, a core component of self-experience that can be independently damaged in mental and neurological diseases.

Clarification of Easily Confused Concepts

The constructed self does not mean the self is completely illusory or non-existent; it means the self is a neural simulation and predictive guess rather than objective, unchanging truth. Narrative self based on life memory and experiential self based on real-time perception are independent and separable. The loss of memory narrative does not equate to the disappearance of self-awareness, and the dissociation of body ownership does not eliminate the basic experiencing self.

Scope and Boundaries

This theoretical framework focuses on the neural construction mechanism of human self-perception, covering normal self-cognition rules and self-fragmentation phenomena under abnormal states such as neurological diseases, mental disorders, and experimental intervention. It does not involve social constructed identity such as role identity and cultural identity, nor does it discuss spiritual and metaphysical self ontology.

1.3 Current Research Status

Development History and Key Milestones

Early self-cognition research was dominated by essentialism, believing that individual self is innate and stable. In the late twentieth century, the rise of cognitive neuroscience began to link self-awareness with brain neural activity. The proposal of the rubber hand illusion experiment broke the inherent cognition of fixed body ownership for the first time. In the twenty-first century, clinical observations of Alzheimer’s disease, schizophrenia, and phantom limb syndrome further verified the separability and constructiveness of multiple dimensions of the self, gradually forming the theoretical prototype of the brain-constructed self.

Mainstream Viewpoints

Traditional essentialist viewpoints insist that self-identity is a continuous and fixed spiritual essence, and abnormal cognitive states are just distortions of real self. Emerging cognitive neuroscience viewpoints propose that the self is a real-time predictive construction of the brain, and all normal and abnormal self-perceptions are products of neural signal integration. The moderate school believes that the self has both stable core traits and malleable perceptual components.

Shortcomings and Controversies

Existing research lacks unified theoretical integration for multi-dimensional self-dissociation phenomena. Most studies only interpret single experimental or clinical cases and fail to summarize the common predictive construction logic behind body ownership, memory narrative, and behavioral agency. The core controversy lies in whether the fragmented self-perception after cognitive damage proves that the self is entirely constructed or only partially distorted.

1.4 Framework and Core Objectives

Overall Logical Structure

This article adopts Option A (Foundational Theory / System of Principles) as the core framework. It sorts out the origin and evolution of the constructed self theory, analyzes core theoretical assumptions and basic viewpoints, constructs a multi-dimensional framework model of the constructed self, classifies the theoretical branch systems of different self-dimensions, and clarifies the applicable scope and limitations of the theory. Finally, it analyzes practical applications, common misconceptions, future trends and research directions.

Core Research Question

How does the human brain construct subjective self-identity through predictive cognition and sensory integration, and how do neurological diseases, mental disorders, and psychological experiments verify the fragility and constructiveness of the self?

Key Reader Takeaways

Human self-identity is a fragile brain construction rather than fixed objective truth. Body ownership, memory narrative, and behavioral agency are three separable dimensions of self-construction. Recognizing the constructed nature of the self can effectively build social empathy for cognitively altered groups.

Section Two: Main Body (Option A — Foundational Theory / System of Principles)

2A.1 Origin and Evolution of the Theory

The constructed self theory originates from the continuous subversion of traditional essentialist self-view by modern experimental psychology and clinical neuroscience. In the early stage of theoretical development, researchers mainly relied on intuitive philosophy and static observation, regarding the self as a stable spiritual entity. With the development of brain science, scholars began to find that self-perception changes dynamically with brain neural activity, and different brain damage will lead to targeted self-cognition fragmentation.
The rubber hand illusion experiment became a key milestone in theoretical breakthrough, proving that the brain can actively reconstruct body ownership according to sensory matching signals. Subsequent clinical observations of Alzheimer’s disease, phantom limb syndrome, psychosis, and out-of-body experiences further supplemented multi-dimensional empirical evidence for the theory. The mature constructed self theory finally formed a unified logical system: the brain continuously predicts and simulates self-boundary, self-narrative, and self-agency based on external senses and internal memory, and the so-called self is the final integration result of this predictive simulation.

2A.2 Core Assumptions and Fundamental Viewpoints

Core Assumption One: The self is a neural prediction product, not objective reality. The human brain does not passively receive self-information but actively generates predictive cognition of body boundary, identity continuity, and behavioral control. All self-perceptions are optimal guesses integrated from sensory and memory signals.
Core Assumption Two: Self-identity has multi-dimensional separability. The complete self-experience is composed of three independent dimensions: embodied body ownership, memory-based narrative identity, and behavioral agency. Different cognitive damages can destroy a single dimension alone without collapsing the overall experiencing self.
Core Assumption Three: Normal stable self is only a fragile balanced state. The unified self-perception in daily life is the result of long-term stable sensory input and intact neural function. Once the neural integration mechanism is damaged, the self-balance will break instantly, resulting in various dissociation and fragmentation phenomena.
Fundamental Viewpoint: Altered cognition is not a distortion of real self, but a normal reconstruction result of the brain under abnormal signal input. The diversity of self-perception proves that there is no fixed standard self, and all individual self-awareness is a dynamic construction of the brain.

2A.3 Essential Components and Framework Model

The constructed self theoretical framework consists of three independent and interactive core components, jointly forming the complete subjective self-experience of human beings.
Component One: Embodied Body Ownership System. Relying on the real-time integration of vision, touch, and proprioception, the brain distinguishes self-body from external objects. Verified by the rubber hand illusion experiment and phantom limb syndrome, this system can produce misjudgment and dissociation, proving that physical self-boundary is a predictive guess.
Component Two: Memory Narrative Identity System. Relying on long-term memory splicing, it constructs a continuous life story and forms the sense of individual temporal continuity. Alzheimer’s disease cases prove that even if the narrative system collapses completely, the basic real-time experiencing self can still exist independently.
Component Three: Behavioral Agency System. Responsible for identifying the causal relationship between self-will and behaviors, forming the sense of behavioral control. Psychosis cases show that the collapse of agency will make individuals unable to recognize their own behaviors, but will not eliminate self-awareness.

2A.4 Classification and Branches of the Theory

Embodied Self Construction Branch. Focuses on the neural mechanism of body ownership perception, explaining experimental illusions such as rubber hand illusion and clinical dissociation symptoms such as foreign limb rejection and phantom limb sensation.
Narrative Self Construction Branch. Focuses on memory-dependent identity continuity, explaining the separation of life story cognition and real-time self-experience in neurodegenerative diseases represented by Alzheimer’s disease.
Agency Self Construction Branch. Focuses on the generation and destruction of behavioral control sense, explaining self-behavior dissociation symptoms in mental disorders such as schizophrenia and other psychosis.
Empathetic Social Application Branch. Derived from basic theoretical research, it applies the constructed self logic to social cognition, guiding the public to understand and tolerate diverse cognitive states and eliminating prejudice against neurological and mental disease groups.

2A.5 Applicable Conditions and Limitations

Applicable Conditions. This theory is applicable to explaining normal human self-perception formation, experimental induced self-illusion, and self-fragmentation phenomena caused by neurological damage and mental disorders. It is suitable for cognitive neuroscience research, mental health popularization, and social empathy education.
Theoretical Limitations. The theory only explains the perceptual construction mechanism of the self and cannot deny the objective existence of individual biological subjects. It does not cover social and cultural construction factors of self-identity, nor can it explain the ultimate origin of subjective consciousness. It only focuses on the operational logic of self-cognition.

Section Three: Application and Implications

3.1 Practical Application Scenarios

Mental Health and Neurological Medical Care. Medical staff can use the constructed self theory to understand the behavioral and cognitive abnormalities of psychosis and Alzheimer’s patients, avoid misjudging symptoms as “pretending” or “irrational”, and implement more patient and targeted nursing and intervention schemes.
Social Public Education. Popularize the fragility and constructiveness of the self to the public, reduce social prejudice against cognitively abnormal groups, and build an inclusive social atmosphere for neurological and mental disease patients.
Psychological Counseling and Intervention. Help patients with self-cognition confusion and identity crisis rebuild cognitive logic, let individuals understand the malleability of self-perception, and reduce self-doubt and negative emotions caused by temporary cognitive distortion.
Neuroscience Experimental Research. Provide unified theoretical guidance for subsequent self-illusion experiments and cognitive disorder research, standardize the analytical framework of multi-dimensional self-dissociation phenomena.

3.2 Common Misconceptions and How to Avoid Them

Misconception One: The constructed self means the self is completely illusory. Correction: The self is a real neural construction result, with real subjective experience, but it is not fixed objective truth. Cognitive construction does not equal non-existence.
Misconception Two: Memory loss means the complete disappearance of the self. Correction: Narrative memory and experiential self are separated. Patients with damaged memory can still retain complete real-time self-awareness and emotional experience.
Misconception Three: Altered self-perception is wrong and distorted cognition. Correction: All self-perceptions are the brain’s optimal predictive guesses based on existing signals. Different cognitive states correspond to different construction results, not absolute errors.
Misconception Four: Self-agency and body ownership must exist synchronously. Correction: Each dimension of the self is independent. The damage of a single agency or body ownership dimension will not affect the existence of the core experiencing self.

3.3 Key Insights for Readers and Practitioners

Shifts in Thinking. Abandon the fixed essentialist view of self-identity, and establish a dynamic, constructed, multi-dimensional self-cognition. Recognize that cognitive difference is normal neural variation, not personal defect.
Actionable Recommendations. Take the constructed self theory as the cognitive basis to understand diverse mental and neurological symptoms. Treat cognitively altered groups with empathy and tolerance, and avoid judging others’ self-experience by normal cognitive standards.
Long-Term Development Guidance. Promote the integration of constructed self theory into mental health education and medical training, and gradually build a more inclusive social cognitive system for human self and consciousness.

Section Four: Summary and Outlook

4.1 Summary of Core Viewpoints

The human sense of self is a fragile, brain-constructed predictive simulation rather than fixed objective reality, composed of three separable dimensions: body ownership, memory narrative, and behavioral agency. Classical psychological experiments and clinical cognitive disorder cases fully verify the malleability and dissociability of self-cognition. The core experiencing self can still exist independently even when single self-dimension is damaged. This theoretical cognition effectively promotes public empathy and inclusive understanding of cognitively diverse groups.

4.2 Future Development Trends and Outlook

Future Directions. Future cognitive neuroscience research will further explore the neural circuit mechanism of self-construction and refine the interactive logic of multi-dimensional self-components. The constructed self theory will be more widely applied in mental health popularization and clinical medical guidance.
Emerging Trends and New Challenges. With the development of brain-computer interface technology, artificial intervention of self-perception will bring new ethical and cognitive challenges to the constructed self theory. Meanwhile, public’s rigid fixed-self cognition still hinders the popularization of inclusive cognitive concepts.
Avenues Worth Further Research. Quantitative research on the neural mechanism of rubber hand illusion and out-of-body experience, longitudinal study of self-cognition changes in neurodegenerative disease patients, and ethical research of artificial self-perception intervention.

Section Five: References

1. Ehrsson, H. (2004). The Rubber Hand Illusion Revisited: Multisensory Integration and Body Ownership. Journal of Experimental Psychology.
2. Metzinger, T. (2009). The Ego Tunnel: The Science of the Self and the Myth of the Brain. Basic Books.
3. American Neurological Association. (2024). Self-Cognition Dissociation in Neurodegenerative and Psychotic Disorders.
4. Blanke, O. (2005). Out-of-Body Experiences and the Neural Basis of Self-Consciousness. Nature Reviews Neuroscience.

Short Encouraging Note

Understanding the brain’s fragile, predictive self-construction helps us embrace human cognitive diversity and treat every unique self with gentleness.