Interpersonal neurobiology (IPNB) is a comprehensive, interdisciplinary framework that explores how the mind, brain, and relationships interact to shape human development and well-being. Developed by Dr. Daniel Siegel and Dr. Allan Schore in the 1990s, IPNB integrates findings from neuroscience, psychology, attachment theory, and other disciplines to understand how our experiences—particularly within relationships—physically change the structure and function of our brains throughout life.
At its core, IPNB posits that the mind is both relational and embodied, and that integration—the linking of differentiated parts into a coherent whole—is the foundation of mental health. This revolutionary approach has transformed how mental health professionals understand trauma, healing, and human development.
Table of Contents
- What Is Interpersonal Neurobiology?
- Core Principles and Concepts
- The Neuroscience Foundation
- IPNB and Mental Health Treatment
- Applications Across Settings
- Research and Evidence Base
- Training and Professional Development
- Frequently Asked Questions
- How Therapy Can Help / Find a Therapist
What Is Interpersonal Neurobiology?
Interpersonal neurobiology is not a form of therapy but rather a framework that focuses on deepening our understanding of the mind and human development across the lifespan. IPNB views the mind as a process that regulates the flow of energy and information through its neurocircuitry, which is then shared and regulated between people through engagement, connection, and communication.
The framework recognizes that the brain is fundamentally a social organ shaped by relationships. IPNB suggests that our interactions with others can directly influence the architecture of our brains, affecting our thoughts, feelings, and behaviors. This understanding has profound implications for how we approach mental health, education, parenting, and organizational leadership.
The Triangle of Well-Being
A central concept in IPNB is the Triangle of Well-Being, which illustrates the interdependence of the brain, mind, and relationships. According to this model, changes in one corner of the triangle can influence the other two, demonstrating how our neural processes, subjective experiences, and interpersonal interactions are deeply interconnected.
Core Principles and Concepts
Integration as Mental Health
IPNB emphasizes the importance of integration, or the balanced flow of information and energy within the brain and between individuals. Dr. Siegel describes mental health as a "river of integration" flowing harmoniously between two extremes: rigidity on one bank and chaos on the other. When integration is disrupted, individuals may experience symptoms of various mental health conditions.
The Embodied and Relational Mind
IPNB proposes that the mind is not limited to the skull-encased brain or the skin-encased body. As neither skull nor skin impedes energy flow, the mind emerging from it is fully embodied and fully relational. The mind is understood as the embodied and relational process that regulates the flow of energy and information both within and between brains.
Nine Domains of Integration
IPNB identifies nine essential neurobiological and interpersonal functions controlled by the prefrontal cortex, including:
- Body regulation - Managing physiological processes
- Attuned communication - Sensing others' internal states
- Emotional balance - Maintaining emotional equilibrium
- Response flexibility - Pausing before reacting
- Fear modulation - Calming fear responses
- Empathy - Understanding others' experiences
- Insight - Self-awareness and reflection
- Moral awareness - Ethical thinking and behavior
- Intuition - Accessing bodily wisdom
The Neuroscience Foundation
Neuroplasticity Throughout Life
Once believed to occur only during early development, research now shows that neuroplasticity—the brain's ability to reorganize itself—continues throughout the lifespan, supporting learning, memory, and recovery from injury or disease. Neuroplasticity encompasses a range of mechanisms, including changes in synaptic strength and connectivity, the formation of new synapses, alterations in the structure and function of neurons, and the generation of new neurons.
While neuroplasticity is most pronounced during childhood and adolescence, it remains present throughout adulthood, though with declining capacity as individuals age. The brain's ability to form and adapt this vast network of neural connections enables younger brains to take in new information quickly and form new neural connections, which explains why children have an easier time learning new languages than adults.
Impact on Brain Structure
According to Siegel's interpersonal neurobiology perspective, change occurs in relation to another person, making relational quality critical. IPNB proposes that interpersonal experiences have substantial impact on brain development early in life. Siegel notes that disruptions to the continuity, presence, and availability of the caregiver result in attachment disorders that manifest as physical changes in neural structures that shape the perception of reality.
Meditation and Brain Changes
Research has shown that mindfulness-based interventions can improve cognitive functioning. Studies have shown that mindfulness meditation is significantly superior to placebo treatments in reducing both the intensity and unpleasantness of pain, believed to be derived from the potential of mindfulness to change activity within the brain in areas important for pain perception and emotional processing around the orbitofrontal cortex and anterior cingulate cortex.
Mindfulness has been shown to induce neuroplasticity, increase cortical thickness, reduce amygdala reactivity, and improve brain connectivity and neurotransmitter levels, leading to improved emotional regulation, cognitive function, and stress resilience. Meta-analyses have found significant structural volume increases in brain regions including the right insula and precentral gyrus following mindfulness-based interventions.
IPNB and Mental Health Treatment
Understanding Trauma Through IPNB
From an IPNB perspective, every symptom commonly associated with PTSD or complex trauma can be seen as a reflection of underlying neural and interpersonal fragmentation. IPNB recognizes the interconnectedness of brain, mind, and relationships, promoting a holistic approach to healing by addressing cognitive, emotional, neurophysiological, and relational aspects of trauma.
Interpersonal neurobiology describes how our brains and bodies are affected by disconnection, trauma, and a lack of compassionate reflection. Through warm, attuned relationships, coupled with practical information about how the nervous system works, therapists can support clients in deep, transformative healing.
Therapeutic Applications
From an IPNB perspective, the primary therapeutic objective in trauma treatment is to support the client in moving from disintegration toward integration—neural, emotional, cognitive, and interpersonal. Key therapeutic strategies include:
Mindful Awareness Practices
Mindful awareness practices enhance vertical integration by improving cortical regulation of subcortical emotional responses. These practices help clients develop greater self-awareness and emotional regulation capacity.
Narrative Integration
Narrative and expressive therapies foster horizontal integration by bridging emotional and verbal processing, helping clients make coherent sense of fragmented traumatic memories. IPNB incorporates the power of storytelling and narrative in the healing process, allowing individuals to make sense of their experiences and reshape their personal narratives in a more empowering way.
Relational Interventions
Relational interventions and attachment-focused therapies aim to promote interpersonal integration, heal relational injuries, and foster secure attachment patterns, which are essential for emotional stability and resilience. IPNB incorporates insights from attachment theory, recognizing the significance of secure attachments in early life and their ongoing impact on emotional regulation and resilience throughout one's lifespan.
Clinical Evidence
Research on IPNB training has shown positive outcomes for mental health professionals. Clinicians report increased self-awareness, presence in relationships with others, and confidence in their intuition. The majority of participants noted movement toward more secure attachments, allowing them to better engage with clients. They reported greater awareness of reactions to clients that were due to their own personal histories, allowing them to respond more to clients' needs. Participants reported that IPNB's perspective on experiences influencing brain development helped them see individuals' struggles in a less pathological frame, which was deemed likely to improve empathy and the therapeutic relationship.
Applications Across Settings
Mental Health and Psychotherapy
In therapy, IPNB provides a framework for understanding and treating mental health disorders through the lens of relationships and neural integration. Now with over eighty textbooks in the Norton Professional series on Interpersonal Neurobiology, this framework offers a wide array of disciplines a unique and useful approach to helping the mind grow and thrive.
Education and Parenting
In education, IPNB informs approaches that support emotional and social development alongside cognitive learning. For parents, IPNB offers insights into how attachment and communication impact children's brain development. Neuroplasticity throughout life allows this kind of growth within clients and within ourselves, as practitioners.
Organizations and Leadership
In the corporate world, IPNB sheds light on how leadership and organizational practices can promote psychological safety and team effectiveness. The Interpersonal Whole Brain Model of Care recognizes that individuals have unique functional processes and posits that despite differential or divergent developmental pathways, learning and change can occur when guided by trained, compassionate professionals.
Working with Diverse Populations
The Interpersonal Neurobiology perspective provides a way to support Black, Indigenous, and other People of Color in deep trauma healing, which expands the ability to heal from the daily dehumanization of racial microaggressions and other forms of systemic oppression. The foundation of Interpersonal Neurobiology is that we must feel safe in order to heal. Safety is the intervention. Without safety, our nervous systems remain in an activated state to attempt to protect ourselves.
Research and Evidence Base
Neuroimaging Studies
Recent bibliographic reviews of interpersonal neurobiology show that research predominantly utilizes neuroimaging techniques, with a rising focus on neural networks and differentiating behavioral patterns. Integrating insights from psychology, economics, and sociology, this interdisciplinary field holds promise for advancing our understanding through a neurobiological lens.
Meta-analyses of mindfulness-based interventions have shown meaningful effects on specific cognitive domains. These findings suggest that the effects of MBIs on improved self-regulation and reduced mind-wandering might be partly accounted for by specific cognitive domains serving as theoretical mechanisms of change.
Clinical Outcomes Research
Current research indicates that person-centered, humanistic approaches informed by IPNB are necessary for neurodevelopmental conditions. Co-creating treatments and interventions with neurodivergent individuals has been highly successful due to the established connections between families and providers. These interventions can reduce negative social and emotional behaviors associated with various conditions.
Mindfulness-based interventions, a key component of IPNB approaches, cultivate awareness of the present moment through structured exercises such as breath awareness, body scans, or open monitoring meditation. These practices are believed to foster psychological stability by reducing emotional reactivity and disengagement from maladaptive thought patterns. As a cognitive training approach, MBIs aim to improve attention, emotional self-regulation, well-being, and quality of life.
Training and Professional Development
Professional Training Programs
Training for IPNB is offered through various colleges, universities, and training centers worldwide. In mastery-level certificate courses, professionals learn how to apply IPNB to their work and to the everyday challenges of life, addressing common clinical situations including those arising from adverse childhood experiences and other forms of trauma.
Core Learning Objectives
Professional IPNB training typically includes:
- Understanding the definition of mind from an interpersonal neurobiology perspective
- Identifying the roles of and relationship between the left and right sides of the brain
- Recognizing impediments to integration which can lead to chaos or rigidity
- Explaining the role of implicit and explicit memory in trauma resolution and health
- Assessing the "coherency of narrative"—how we have come to make sense of our lives
- Learning practical techniques to support various domains of integration
- Developing skills for building resilience and promoting well-being
The Norton Series on Interpersonal Neurobiology
The Norton Series on Interpersonal Neurobiology, edited by Dr. Dan Siegel, offers a comprehensive study of the mind, brain, relationships, and an integrated view of mental health. It serves as an invaluable resource for professionals across various disciplines, including psychology, psychiatry, neuroscience, social work, education, and counseling.
Frequently Asked Questions
What makes IPNB different from other therapeutic approaches?
Unlike standard cognitive-only therapies, IPNB acknowledges the brain's capacity to change and adapt through neuroplasticity, offering hope for recovery through interventions that foster positive neural patterning and the formation of new, healthier pathways. The interdisciplinary nature of Interpersonal Neurobiology, combining neuroscience, psychology, and social sciences, makes it a comprehensive and effective framework for navigating the complexities of trauma and chronic stress recovery.
Can IPNB help with specific mental health conditions?
Yes, IPNB-informed approaches have shown promise for various conditions. Research evidence suggests value in combining approaches for reducing symptoms of various neurodevelopmental disorders, including autism. Studies have noted positive effects on brain health in settings related to addictive disorders and palliative care, suggesting that mindfulness-based approaches within IPNB might have a bearing on neural circuits underpinning stress response and reward processing.
How does IPNB understand the relationship between brain and behavior?
IPNB views the four facets of mind—subjectivity, consciousness, information processing, and self-organization—as aspects of a complex system's emergence arising from energy flow. As neither skull nor skin impedes energy flow, the mind emerging from it is not limited to the brain or body but is fully embodied and relational.
What is the role of relationships in IPNB?
IPNB underscores the importance of relationships in healing, highlighting the impact of positive social interactions on brain functioning. Building supportive connections can contribute significantly to recovery. Our mental lives are profoundly relational. The interactions we have with one another shape our mental world.
Is there scientific evidence supporting neuroplasticity in adults?
Research confirms that the brain is never fixed but continues to change with learning and experience throughout life. Biology does not mean predetermined—your brain is shaped by your experiences and continues to change along with learning across the lifespan. Studies have shown that increased physical activity, exposure to enriched environments, and certain interventions can enhance neurogenesis and improve learning and memory.
How long does it take to see changes from IPNB-informed treatment?
Research has shown no evidence that the number of sessions and treatment duration are significant moderators of treatment effects, contradicting dose-response hypotheses. These findings are encouraging since brief interventions might alleviate distress and enhance cognitive functioning, which could have major clinical implications concerning scalability and dissemination.
How Therapy Can Help / Find a Therapist
IPNB-informed therapy offers a unique, science-based approach to healing that recognizes the profound connections between your mind, brain, and relationships. By working with a therapist trained in interpersonal neurobiology principles, you can:
- Develop greater self-awareness and emotional regulation
- Heal from trauma by promoting neural integration
- Build more secure and satisfying relationships
- Enhance your capacity for mindfulness and presence
- Create lasting positive changes in your brain and behavior
If you're interested in exploring how IPNB can support your mental health journey, consider connecting with a therapist who incorporates these principles into their practice. Look for professionals who:
- Have training in interpersonal neurobiology or attend IPNB workshops
- Use integrative approaches that address mind, brain, and relationships
- Emphasize the therapeutic relationship as a vehicle for healing
- Incorporate mindfulness and body-based interventions
- Understand trauma from a neurobiological perspective
[Find a therapist near you](https://www.goodtherapy.org/find-therapist.html) who can help you harness the power of interpersonal neurobiology for healing and growth.
References:
- [Find a therapist near you](https://www.goodtherapy.org/find-therapist.html) who can help you harness the power of interpersonal neurobiology for healing and growth.
- Bakshi, A., & Srivastava, R. (2024). Neurobiological understanding of yoga and mindfulness: Effects on neuronal function, stress, and well-being. Biomedicines, 12(11), 2613. https://doi.org/10.3390/biomedicines12112613
- Goldberg, S. B., Riordan, K. M., Sun, S., & Davidson, R. J. (2023). The empirical status of mindfulness-based interventions: A systematic review of 44 meta-analyses of randomized controlled trials. Perspectives on Psychological Science, 18(1), 132-157. https://doi.org/10.1177/17456916211068817
- Jong, M., et al. (2025). The effects of mindfulness‐based intervention on cognitive functions in tertiary students: A systematic review and meta‐analysis. Applied Cognitive Psychology, 39(1), e70056. https://doi.org/10.1002/acp.70056
- Kim, A. J., et al. (2025). The effects of mindfulness meditation on mechanisms of attentional control in young and older adults: A preregistered eye tracking study. Journal of Neuroscience, 45(7). https://doi.org/10.1523/JNEUROSCI.0255-24.2024
- National Institute of Mental Health. (2024). Neuroplasticity. https://www.nimh.nih.gov/health/topics/neuroplasticity
- National Institute of Mental Health. (2023). Psychotherapies. https://www.nimh.nih.gov/health/topics/psychotherapies
- Porges, S. W. (2022). Polyvagal theory: A science of safety. Frontiers in Integrative Neuroscience, 16, 871227. https://doi.org/10.3389/fnint.2022.871227
- Schore, A. N. (2021). The interpersonal neurobiology of intersubjectivity. Frontiers in Psychology, 12, 648616. https://doi.org/10.3389/fpsyg.2021.648616
- Sezer, I., Pizzagalli, D. A., & Sacchet, M. D. (2022). Resting-state fMRI functional connectivity and mindfulness in clinical and non-clinical contexts: A review and synthesis. Neuroscience & Biobehavioral Reviews, 135, 104583. https://doi.org/10.1016/j.neubiorev.2022.104583
- Siegel, D. J., & Drulis, C. (2023). An interpersonal neurobiology perspective on the mind and mental health: Personal, public, and planetary well-being. Annals of General Psychiatry, 22(1), 5. https://doi.org/10.1186/s12991-023-00434-5
- Voss, P., Thomas, M. E., Cisneros-Franco, J. M., & de Villers-Sidani, É. (2023). Dynamic brains and the changing rules of neuroplasticity: Implications for learning and recovery. Frontiers in Psychology, 14, 1147687. https://doi.org/10.3389/fpsyg.2023.1147687
