APA Citation
Beeney, J., Hallquist, M., Ellison, W., & Levy, K. (2016). Self–Other Disturbance in Borderline Personality Disorder: Neural, Self-Report, and Performance-Based Evidence. *Personality Disorders: Theory, Research, and Treatment*, 7(1), 28-39.
Summary
This research examined self-other disturbances in borderline personality disorder using multiple measurement approaches including neuroimaging, self-report measures, and behavioral tasks. The study found significant disruptions in how individuals with BPD process boundaries between self and others, with corresponding neural differences in brain regions responsible for self-referential processing. These findings help explain the interpersonal difficulties and identity confusion characteristic of BPD, which often develops following chronic childhood trauma and abuse.
Why This Matters for Survivors
Survivors of narcissistic abuse often struggle with confused boundaries and identity issues similar to those found in BPD. This research validates the neurobiological reality of these struggles, showing they're not personal failings but measurable brain differences. Understanding these self-other disturbances helps explain why recovery involves rebuilding both identity and healthy relationship patterns.
What This Research Establishes
Self-other confusion has measurable neurobiological markers - Brain imaging revealed specific differences in how individuals with BPD process self-referential information, validating that identity confusion is a real neurological phenomenon, not a personal weakness.
Multiple assessment methods confirm boundary disturbances - Using neuroimaging, self-report questionnaires, and behavioral tasks, researchers found consistent evidence of disrupted self-other differentiation across different measurement approaches.
Identity disturbance affects interpersonal functioning - The study demonstrated clear connections between difficulties distinguishing self from others and problems in relationships, explaining why abuse survivors often struggle with boundaries.
Trauma-related symptoms have distinct neural signatures - Brain activity patterns in regions responsible for self-awareness and emotional processing showed specific alterations that correspond to the interpersonal difficulties characteristic of trauma responses.
Why This Matters for Survivors
If you’ve struggled with knowing where you end and others begin, this research validates your experience. The identity confusion and boundary difficulties you may face aren’t character flaws - they’re measurable changes in how your brain processes information about yourself versus others. This often develops as a survival response to chronic abuse.
Many survivors report feeling like they “lost themselves” in abusive relationships. This research helps explain why: narcissistic abuse systematically breaks down your sense of self through tactics like gaslighting, projection, and constant boundary violations. Your brain adapted to this environment by becoming hyper-focused on the abuser’s emotions and needs.
The good news is that understanding these patterns is the first step toward healing. When you recognize that your struggles with identity and boundaries have a neurobiological basis, you can approach recovery with more compassion for yourself and realistic expectations about the healing process.
Recovery involves rebuilding your sense of self and learning healthy ways to relate to others. This takes time and often professional support, but the brain’s capacity for change means healing is possible. You can develop clearer boundaries and a stronger sense of who you are.
Clinical Implications
This research emphasizes the importance of addressing identity disturbance directly in treatment. Therapists working with trauma survivors should assess for self-other boundary confusion and incorporate interventions specifically designed to strengthen identity formation and interpersonal functioning.
The neurobiological findings support the use of trauma-informed approaches that recognize how abuse affects brain development. Treatment should focus on helping clients develop better self-awareness and emotional regulation skills while rebuilding their capacity for healthy relationships.
Dialectical Behavior Therapy (DBT) and other approaches that explicitly address identity disturbance and interpersonal effectiveness show particular promise. The research suggests that interventions targeting self-other differentiation may be crucial for long-term recovery from complex trauma.
Clinicians should also recognize that identity work takes time and patience. The neurobiological nature of these changes means that healing involves actual brain rewiring, which occurs gradually through consistent therapeutic work and corrective relational experiences.
How This Research Is Used in the Book
This study provides crucial scientific backing for understanding how narcissistic abuse affects survivors’ sense of self and ability to maintain healthy boundaries. The neurobiological evidence helps validate survivors’ experiences while explaining the recovery process.
“The research on self-other disturbances reveals why so many survivors say they ‘lost themselves’ in abusive relationships. When someone systematically attacks your reality, projects their emotions onto you, and violates your boundaries, your brain adapts by becoming unclear about what belongs to you versus what belongs to them. Recovery isn’t just about leaving the relationship - it’s about rebuilding your neural pathways for healthy self-other differentiation.”
Historical Context
Published in 2016, this study emerged during a crucial period when neuroscience research was beginning to validate many clinical observations about trauma’s effects on personality development. It contributed to the growing body of evidence showing that conditions like BPD often develop as adaptations to chronic interpersonal trauma, helping reduce stigma and improve treatment approaches.
Further Reading
• Fonagy, P., & Bateman, A. W. (2007). Mentalizing and borderline personality disorder. Journal of Mental Health, 16(1), 83-101.
• Schmahl, C., & Bremner, J. D. (2006). Neuroimaging in borderline personality disorder. Journal of Psychiatric Research, 40(5), 419-427.
• Sharp, C., & Fonagy, P. (2008). The parent’s capacity to treat the child as a psychological agent: Constructs, measures and implications for developmental psychopathology. Social Development, 17(3), 737-754.
About the Author
Joseph E. Beeney is a clinical psychologist and researcher at the University of Pittsburgh, specializing in personality disorders and neuroimaging studies of interpersonal functioning.
Michael N. Hallquist is a clinical psychologist at Pennsylvania State University whose research focuses on computational approaches to understanding personality disorders and interpersonal dynamics.
William D. Ellison is a personality psychology researcher who studies the measurement and assessment of personality pathology and interpersonal functioning.
Kenneth N. Levy is a clinical psychologist at Pennsylvania State University and leading researcher in attachment theory, personality disorders, and psychotherapy outcomes.
Historical Context
Published during a period of increased integration between neuroscience and personality disorder research, this study contributed to the growing understanding of how trauma affects brain development and interpersonal functioning.
Frequently Asked Questions
Self-other disturbances involve difficulty distinguishing between your own thoughts, feelings, and identity versus those of others, often resulting from chronic abuse that disrupted healthy boundary development.
Narcissistic abuse systematically breaks down victims' sense of self through gaslighting, projection, and boundary violations, creating confusion about what belongs to the victim versus the abuser.
Yes, the brain's neuroplasticity allows for healing through therapy, healthy relationships, and trauma-informed treatment approaches that help rebuild healthy self-other differentiation.
Chronic abuse disrupts normal identity development by forcing survivors to focus on the abuser's needs and emotions rather than developing their own sense of self.
Many BPD symptoms, including identity disturbance and interpersonal difficulties, can develop as responses to chronic childhood abuse and trauma, including narcissistic abuse.
Rebuilding boundaries involves therapy, learning to identify your own emotions versus others', practicing saying no, and developing a strong sense of personal identity and values.
Research demonstrates that trauma physically changes brain structure and function, particularly in areas responsible for self-awareness, emotional regulation, and interpersonal processing.
Recovery varies by individual, but with consistent therapy and support, survivors can develop healthier self-other differentiation over months to years of healing work.