# IPTrauma — Psychotraumatology Knowledge Base

> An open, clinician-oriented reference on the history, neurobiology, phenomenology, and evidence-based treatment of psychological trauma. Every article cites primary literature.

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## History of Psychotraumatology
> The origins and conceptual development of psychotraumatology as a discipline.

- [History and Conceptual Development of Psychotraumatology](/docs/history-of-psychotraumatology/history-and-conceptual-development-of-psychotraumatology/): Early Foundations: Trauma as an “Unconscious” Phenomenon (Charcot, Janet, Freud) Modern Psychotraumatology has its roots in late 19th-century clinical observations of hysteria and psychological shock. In the 1880s, Jean-Martin Charcot and his student Pierre Janet in France were among the first to investigate how traumatic experiences could lead to psychological symptoms systematically. Charcot observed “traumatic
- [The Emergence of PTSD: From Post-Vietnam Syndrome to DSM Recognition](/docs/history-of-psychotraumatology/the-emergence-of-ptsd-from-post-vietnam-syndrome-to-dsm-recognition/): In 1980, the American Psychiatric Association formally recognized Post-Traumatic Stress Disorder (PTSD) as a psychiatric diagnosis in the third edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-III). This landmark shift legitimized trauma as a cause of persistent mental health symptoms (American Psychiatric Association [APA], 1980). This inclusion was driven by multidisciplinary research
- [Trauma as a Discrete External Event: War Neuroses and the Rise of PTSD](/docs/history-of-psychotraumatology/trauma-as-a-discrete-external-event-war-neuroses-and-the-rise-of-ptsd/): In the early-to-mid-20th century, the prevailing view of trauma shifted toward seeing it as a response to discrete external events, particularly the horrors of war and other large-scale catastrophes. While psychoanalysts during the interwar period gave limited attention to real-life trauma, military psychiatrists observed acute psychological breakdowns among soldiers that could not be ignored. World

## Neurobiology of Trauma
> How traumatic experience shapes brain, body, and nervous system.

- [Applying Neurobiology Principles to Trauma Treatment](/docs/neurobiology-of-trauma/applying-neurobiology-principles-to-trauma-treatment/): Rationale for Neurobiologically-Informed Therapy Understanding trauma as a neurobiological condition offers profound implications for therapeutic practice. First, it allows clinicians to reframe trauma-related symptoms not as signs of character pathology or weakness, but as predictable consequences of disrupted brain-body systems (van der Kolk, 2014). This reframing is inherently validating: survivors can begin to understand that
- [Autonomic Nervous System and Polyvagal Theory](/docs/neurobiology-of-trauma/autonomic-nervous-system-and-polyvagal-theory/): Another crucial physiological component in trauma is the autonomic nervous system (ANS), which governs involuntary bodily functions and modulates states of arousal and rest. The ANS is divided into two primary branches: the sympathetic nervous system (associated with fight-or-flight responses) and the parasympathetic nervous system (linked to rest, digestion, and repair). Trauma causes profound dysregulation
- [Hypothalamic–Pituitary–Adrenal (HPA) Axis](/docs/neurobiology-of-trauma/hypothalamic-pituitary-adrenal-hpa-axis/): Trauma also provokes enduring changes in the body’s primary stress circuitry, the HPA axis. The HPA axis governs the release of stress hormones (like cortisol and adrenaline) in response to threat. In acute trauma, the HPA axis kicks into high gear – the hypothalamus releases corticotropin-releasing hormone (CRH), the pituitary releases ACTH, and the adrenal
- [Memory Processing and Trauma Imprints](/docs/neurobiology-of-trauma/memory-processing-and-trauma-imprints/): Trauma exerts a profound impact on how memories are encoded, stored, and retrieved. Unlike typical autobiographical memories, traumatic memories are often fragmented, sensory-based, and disorganized, frequently lacking a coherent narrative structure (van der Kolk, 1994). This disruption arises largely from trauma’s effects on the hippocampus (responsible for contextual and temporal memory) and the amygdala, which
- [Neurobiological Imprints of Trauma](/docs/neurobiology-of-trauma/neurobiological-imprints-of-trauma/): Decades of research in psychotraumatology and neuroscience have mapped out how traumatic experiences alter key brain regions and physiological pathways. Researchers have long observed that trauma is “stored in somatic memory and expressed as changes in the biological stress response” (van der Kolk, 1994, p. 253). Intense emotional trauma triggers a cascade of neurochemical and
- [Neurobiological Profiles: PTSD vs. Complex Trauma](/docs/neurobiology-of-trauma/neurobiological-profiles-ptsd-vs-complex-trauma/): Post-Traumatic Stress Disorder (PTSD) – Single-Event Trauma Response PTSD, typically associated with exposure to a single traumatic incident, presents a relatively consistent neurobiological profile. Neuroimaging studies indicate that individuals with PTSD exhibit heightened amygdala activation, reduced hippocampal volume, and diminished activity in the medial prefrontal cortex (mPFC)—regions essential for emotional regulation and contextual memory (Rauch
- [Sympathetic Nervous System & Catecholamines](/docs/neurobiology-of-trauma/sympathetic-nervous-system-catecholamines/): Trauma acutely activates the sympathetic nervous system, which is responsible for the body’s immediate fight-flight-freeze response. This system rapidly mobilizes survival energy through the release of catecholamines, primarily adrenaline (epinephrine) and norepinephrine (NE). These neurochemicals increase heart rate, dilate pupils, redirect blood flow to muscles, and sharpen sensory input—preparing the organism to react to danger

## Body of Knowledge of Psychotraumatology
> Core theories, models, and mechanisms that define modern trauma science.

- [Adaptations of Trauma](/docs/body-of-knowledge-of-psychotraumatology/adaptations-of-trauma/): Traumatic stress reactions are increasingly understood as adaptive responses to abnormal threat, rather than arbitrary “symptoms.” In the face of overwhelming events, the brain and body employ survival-based coping mechanisms that allow the individual to endure and function (Van der Kolk, 2014). These adaptations occur on multiple levels – neurobiological, behavioral, and physiological – and
- [Affective Neuroscience](/docs/body-of-knowledge-of-psychotraumatology/affective-neuroscience/): Affective neuroscience, as conceptualized by Jaak Panksepp, provides valuable insights into trauma by focusing on the neurobiological foundations of emotions. Panksepp (1998) identified seven primary emotional systems in the mammalian brain—SEEKING, FEAR, RAGE, LUST, CARE, PANIC/GRIEF, and PLAY—each rooted in distinct neural circuits that are evolutionarily conserved across species. In trauma-informed care, three of these
- [ANS Regulation Theory: Understanding Trauma Responses](/docs/body-of-knowledge-of-psychotraumatology/ans-regulation-theory-understanding-trauma-responses/): Babette Rothschild, a prominent psychotherapist and trauma specialist, provides a detailed understanding of trauma through her theory of Autonomic Nervous System (ANS) Regulation (Rothschild, 2000, 2017). Rothschild’s work emphasizes how trauma profoundly affects the autonomic nervous system, influencing individuals' physiological reactions and emotional experiences. Autonomic Nervous System and Trauma Rothschild's model builds on the foundation
- [Attachment Styles and Their Relationship to Trauma](/docs/body-of-knowledge-of-psychotraumatology/attachment-styles-and-their-relationship-to-trauma/): Attachment theory identifies four primary attachment styles—secure, anxious-preoccupied, dismissive-avoidant, and disorganized (also referred to as fearful-avoidant)—each reflecting distinct ways in which individuals relate emotionally and behaviorally to caregivers and later significant others (Ainsworth & Bowlby, 1991). Secure Attachment Individuals with a secure attachment style tend to exhibit comfort with both intimacy and autonomy. They generally maintain
- [Attachment Theory and Trauma](/docs/body-of-knowledge-of-psychotraumatology/attachment-theory-and-trauma/): Attachment theory, initially developed by John Bowlby, has evolved to incorporate neurobiological findings and to illuminate the impact of early relational trauma on development. A secure attachment in infancy (formed through consistent, attuned caregiving) is now understood as a primary protector against the harmful effects of stress (Schore, 2001). By contrast, trauma in the context
- [Dysregulation as a Core Mechanism](/docs/body-of-knowledge-of-psychotraumatology/dysregulation-as-a-core-mechanism/): A common thread woven throughout trauma-related disorders is the phenomenon of dysregulation—the impairment in managing emotional and physiological states. Contemporary trauma theorists now widely regard dysregulation of arousal and affect as central to understanding the persistence of trauma symptoms (Van der Kolk, 2014). Individuals who have experienced trauma often struggle to maintain emotional stability, fluctuating
- [How the Body Keeps the Score and Neuroscience of Trauma in the Body](/docs/body-of-knowledge-of-psychotraumatology/how-the-body-keeps-the-score-and-neuroscience-of-trauma-in-the-body/): The influential work of Bessel van der Kolk (2014) has profoundly shaped contemporary trauma theory by articulating the deep neurobiological and somatic imprints trauma leaves on the body. Van der Kolk emphasizes that traumatic experiences are not merely psychological events but profoundly embodied phenomena, reflected and stored throughout the nervous and somatic systems long after
- [Interpersonal Neurobiology](/docs/body-of-knowledge-of-psychotraumatology/interpersonal-neurobiology/): Interpersonal Neurobiology (IPNB), developed and popularized by psychiatrist Daniel J. Siegel, is an interdisciplinary framework that seeks to understand human experience through the interactions between biology, psychology, and interpersonal relationships (Siegel, 1999, 2012). Central to IPNB is the principle that human well-being emerges from integration—the process by which separate elements of the mind and brain
- [Memory and Trauma](/docs/body-of-knowledge-of-psychotraumatology/memory-and-trauma/): Memory plays a pivotal role in trauma, influencing how traumatic experiences are encoded, stored, and recalled. Understanding traumatic memory formation and reconsolidation is essential for effective trauma therapy. Current neuroscientific findings suggest that traumatic memories differ fundamentally from ordinary memories, presenting unique challenges for therapeutic intervention (Brewin, 2011; Van der Kolk, 2014). How Traumatic Memory
- [Parts Theory, Ego-State Theory, and Structural Dissociation: Differences, Overlaps, and Clinical Implications for Trauma](/docs/body-of-knowledge-of-psychotraumatology/parts-theory-ego-state-theory-and-structural-dissociation-differences-overlaps-and-clinical-implications-for-trauma/): Theories emphasizing multiplicity within the personality, such as Parts Theory (Internal Family Systems - IFS), Ego-State Theory, and the Theory of Structural Dissociation, have significantly enriched contemporary trauma treatment by acknowledging internal fragmentation and promoting integration as central therapeutic goals (Fisher, 2017; Schwartz, 2021; Van der Hart et al., 2006). Parts Theory (Internal Family Systems)
- [Polyvagal Theory](/docs/body-of-knowledge-of-psychotraumatology/polyvagal-theory/): Polyvagal Theory, developed by neuroscientist Stephen Porges, has significantly transformed contemporary understandings of trauma, emphasizing the critical role of the autonomic nervous system in trauma responses and healing (Porges, 2011). At its core, Polyvagal Theory provides a biological framework for understanding safety, danger, and life-threatening states, fundamentally reshaping how clinicians conceptualize and address trauma. Foundations
- [Science of Toxic Stress and the ACE Study](/docs/body-of-knowledge-of-psychotraumatology/science-of-toxic-stress-and-the-ace-study/): A cornerstone contribution to the Psychotrauma field came from public health research into Adverse Childhood Experiences (ACEs) and their lifelong effects. The landmark ACE Study, conducted by Felitti et al. (1998), surveyed over 17,000 adults and found a striking dose-response relationship between childhood adversities and subsequent health outcomes. In brief, the more types of adverse
- [The Adaptive Information Processing (AIP) Model: The pathogenic Memory](/docs/body-of-knowledge-of-psychotraumatology/the-adaptive-information-processing-aip-model-the-pathogenic-memory/): Definition of AIP The Adaptive Information Processing (AIP) Model, formulated by Francine Shapiro, serves as the foundational theoretical framework for EMDR therapy (Shapiro, 2018). It posits that the human brain possesses an innate physiological system designed to process experiences and integrate them adaptively, much like how the body heals physical injuries (Shapiro, 2007; Rydberg et
- [Theory of Structural Dissociation and Trauma-Related Dissociation](/docs/body-of-knowledge-of-psychotraumatology/theory-of-structural-dissociation-and-trauma-related-dissociation/): The Theory of Structural Dissociation, developed by Onno van der Hart, Ellert Nijenhuis, and Kathy Steele (2006), provides a comprehensive framework for understanding dissociation as a fundamental consequence of trauma. This theory offers a detailed conceptualization of how traumatic experiences, particularly chronic or developmental trauma, fragment an individual's personality into distinct psychological structures or parts,
- [Understanding the Window of Tolerance in Trauma Theory](/docs/body-of-knowledge-of-psychotraumatology/understanding-the-window-of-tolerance-in-trauma-theory/): The Window of Tolerance, a concept developed by psychiatrist Dan Siegel (1999), describes the optimal emotional zone within which an individual can effectively manage life's ups and downs. Within this "window," a person experiences emotions at a level that feels manageable—they are neither overwhelmed nor numbed out. This state allows individuals to remain connected, regulated,

## Trauma
> Types of trauma — from acute events to intergenerational and collective wounds.

- [Acute Trauma](/docs/trauma/acute-trauma/): Definition and Examples Acute trauma refers to distressing psychological experiences triggered by a single, clearly definable event that overwhelms an individual's coping capacity and disrupts their sense of safety and predictability. Typically, acute traumatic events occur unexpectedly, are limited in duration, and carry a high emotional intensity at the moment of occurrence (Shapiro, 2018; Van
- [Collective Trauma](/docs/trauma/collective-trauma/): Definition and Examples Collective trauma refers to the profound psychological and emotional wounds experienced simultaneously by entire communities or societies following large-scale catastrophic events. Unlike individual trauma, collective trauma impacts broader social groups, altering shared identity, cohesion, and emotional stability at societal and community levels (Hirschberger, 2018). Examples of collective trauma include: Pandemics (e.g., COVID-19,
- [Complex Trauma (Complex PTSD)](/docs/trauma/complex-trauma-complex-ptsd/): Definition and Core Criteria: Chronic, Relational, and Developmental Aspects Complex trauma, commonly referred to as Complex Post-Traumatic Stress Disorder (Complex PTSD or C-PTSD), describes the pervasive and prolonged psychological consequences resulting from chronic, interpersonal, and often early-life traumatic experiences. Unlike single-event trauma, complex trauma typically involves ongoing situations characterized by relational betrayal, emotional and physical
- [Developmental Trauma](/docs/trauma/developmental-trauma/): Trauma Experienced During Key Developmental Stages (Childhood Neglect, Emotional or Physical Abuse) Developmental trauma encompasses prolonged, repeated, or severe traumatic experiences occurring during critical early developmental periods—particularly in infancy, childhood, or adolescence. Unlike single-event trauma, developmental trauma is inherently interpersonal, typically involving caregivers or other trusted individuals who are responsible for nurturing, safety, and emotional
- [Existential-Religious Trauma](/docs/trauma/existential-religious-trauma/): (Moral Injury, Transcendent, Existential, Religious Trauma, and Abuse of Consciousness) Definition and Core Concepts Existential-spiritual trauma encompasses psychological, emotional, spiritual, and relational wounds arising from experiences that profoundly disrupt an individual's core beliefs, ethical foundations, spiritual identity, or sense of existential meaning. This integrated trauma category includes previously distinct yet related concepts: Moral Injury: Psychological
- [Intergenerational (Transgenerational) Trauma](/docs/trauma/intergenerational-transgenerational-trauma/): Mechanisms of Trauma Transmission Across Generations Intergenerational trauma, also termed transgenerational trauma, describes how the psychological impacts of traumatic events are transmitted from one generation to another. Rather than experiencing the trauma firsthand, subsequent generations inherit the trauma's psychological, emotional, and physiological consequences through indirect but consequential mechanisms (Yehuda & Lehrner, 2018). Key mechanisms of
- [Intrauterine & Pre‑Verbal Trauma](/docs/trauma/intrauterine-pre%e2%80%91verbal-trauma/): Defining the Concept Intrauterine trauma refers to stressors experienced prenatally—such as maternal stress, emotional distress, substance exposure, or prenatal medical complications—that can affect fetal development. Pre‑verbal trauma occurs before the acquisition of language, including birth trauma, early neglect, or abuse, which profoundly impacts implicit memory systems. Both operate outside conscious awareness and are carried in
- [Overview of Trauma Types](/docs/trauma/overview-of-trauma-types/): Trauma, by its very nature, profoundly alters individuals’ psychological, emotional, physiological, relational, and even existential landscapes. Though all traumatic experiences share certain defining qualities—such as overwhelming the individual’s coping resources and shattering basic assumptions about safety and control—each trauma category also carries distinct impacts and considerations essential for tailored, effective treatment (Herman, 1992; Courtois &
- [Post-Traumatic Stress Disorder (PTSD)](/docs/trauma/post-traumatic-stress-disorder-ptsd/): Definition and Examples (Single-Event) Post-Traumatic Stress Disorder (PTSD) is a clinical syndrome characterized by persistent emotional distress, intrusive symptoms, avoidance behaviors, and heightened physiological arousal, occurring after experiencing or witnessing a severely distressing or life-threatening event (American Psychiatric Association [APA], 2013). Typically associated with single, clearly identifiable traumatic incidents, PTSD commonly arises from situations such
- [Vicarious and Secondary Trauma](/docs/trauma/vicarious-and-secondary-trauma/): Definition and Identification (Impact on Caregivers, Therapists, First Responders) Vicarious trauma, also known as secondary trauma, refers to the emotional and psychological impact experienced by individuals who regularly support or provide care to trauma survivors. Rather than resulting from direct trauma exposure, vicarious trauma emerges indirectly through empathic engagement, continual exposure to traumatic narratives, or

## The Triphasic Model for Treating Trauma
> The three-phase framework guiding trauma treatment worldwide.

- [Phase One: Safety and Stabilization](/docs/the-triphasic-model-for-treating-trauma/phase-one-safety-and-stabilization/): Safety and stabilization constitute the essential first phase of trauma recovery, fundamentally shaping the effectiveness of all subsequent therapeutic interventions. Given trauma’s inherent nature—characterized by chaos, overwhelm, loss of control, and feelings of unsafety—establishing a secure foundation is a non-negotiable prerequisite for successful healing (Herman, 1992; Courtois & Ford, 2013). Primary Objectives: Establishing Physical, Emotional,
- [Phase Three: Integration and Rehabilitation](/docs/the-triphasic-model-for-treating-trauma/phase-three-integration-and-rehabilitation/): After trauma memories have been safely processed and adaptively restructured, clients enter the Integration and Rehabilitation phase. This stage is crucial for translating therapeutic gains into sustainable changes, personal growth, and meaningful reintegration into daily life. 1. Integration of Processed Traumatic Experiences Core Objectives: Facilitate a coherent narrative that integrates traumatic experiences into a person's
- [Phase Two: Trauma Memory Processing](/docs/the-triphasic-model-for-treating-trauma/phase-two-trauma-memory-processing/): Once stable safety, emotional regulation, and therapeutic trust have been firmly established, the patient moves into the second phase of trauma recovery: trauma memory processing. This phase involves safely accessing, processing, and integrating traumatic memories to reduce their emotional intensity and cognitive fragmentation, ultimately promoting healing, coherence, and resolution (Herman, 1992; Courtois & Ford, 2013).

## Evidence-Based Trauma Therapies and Models
> Clinical modalities with research support for treating traumatic stress.

- [Criteria for Evaluating Trauma Therapies](/docs/evidence-based-trauma-therapies-and-models/criteria-for-evaluating-trauma-therapies/): Selecting appropriate therapeutic interventions in psychotraumatology requires clearly defined criteria that ensure treatments are effective, clinically sound, ethically responsible, and culturally responsive. This section delineates the essential criteria used to evaluate and select trauma therapies, including empirical support, neurobiological coherence, and ethical and cultural considerations. 2.1 Empirical Support (Efficacy vs. Effectiveness) Evaluating the empirical support
- [Deep Brain Reorienting (DBR)](/docs/evidence-based-trauma-therapies-and-models/deep-brain-reorienting-dbr/): Deep Brain Reorienting (DBR), developed by psychiatrist Frank Corrigan, is a specialized trauma therapy explicitly designed to address deep-seated trauma impacts at the subcortical, neurophysiological level. DBR is particularly suitable for trauma marked by intense emotional and somatic dysregulation, chronic dissociation, and unresolved survival-based responses. Foundational Principles DBR is grounded in trauma neuroscience, specifically targeting
- [Eye Movement Desensitization and Reprocessing (EMDR)](/docs/evidence-based-trauma-therapies-and-models/eye-movement-desensitization-and-reprocessing-emdr/): Eye Movement Desensitization and Reprocessing (EMDR) therapy, originally developed by Francine Shapiro in the late 1980s, is a structured, integrative psychotherapeutic approach specifically designed to alleviate distress associated with traumatic memories. EMDR uniquely integrates cognitive, emotional, somatic, and neurological components, employing bilateral stimulation—most commonly eye movements—to facilitate the reprocessing of traumatic memories. Foundational Principles of
- [Finding Solid Ground – Stabilization Program for Trauma-Related Dissociation](/docs/evidence-based-trauma-therapies-and-models/finding-solid-ground-stabilization-program-for-trauma-related-dissociation/): Overview Finding Solid Ground is a structured, psychoeducational stabilization program specifically designed for individuals with trauma-related dissociation. Developed by Dr. Bethany Brand, Dr. Ruth Lanius, and other experts in dissociation, it provides a step-by-step, skills-based framework that can be delivered in group or individual formats. Its goal is to help clients strengthen safety, self-regulation, and
- [Internal Family Systems (IFS) Therapy](/docs/evidence-based-trauma-therapies-and-models/internal-family-systems-ifs-therapy/): Internal Family Systems (IFS) therapy, developed by Richard Schwartz in the 1980s, has emerged as a highly effective and innovative approach for treating complex trauma and related psychological disorders. IFS conceptualizes the psyche as comprising distinct internal "parts," each embodying unique roles, emotions, and beliefs that are formed through developmental experiences, particularly those involving trauma.
- [Neurofeedback and Biofeedback](/docs/evidence-based-trauma-therapies-and-models/neurofeedback-and-biofeedback/): Neurofeedback and biofeedback are physiologically targeted interventions that train regulation of the nervous system by providing real-time feedback on brain or body signals. In psychotraumatology, they are used to restore autonomic flexibility, dampen hyperarousal, reduce dissociation, and improve attention/affect regulation—capacities often eroded by trauma. Foundational principles Operant conditioning of physiology: clients learn to increase desirable
- [Neurosequential Model of Therapeutics (NMT)](/docs/evidence-based-trauma-therapies-and-models/neurosequential-model-of-therapeutics-nmt/): Overview The Neurosequential Model of Therapeutics (NMT), developed by Dr. Bruce Perry, is a developmentally informed, neurobiologically grounded framework for assessing and treating children, adolescents, and adults with histories of trauma, neglect, and disrupted attachment. NMT is not a standalone therapy, but rather a clinical map that guides the selection, sequencing, and timing of interventions
- [Polyvagal Theory–Informed Therapies](/docs/evidence-based-trauma-therapies-and-models/polyvagal-theory-informed-therapies/): Polyvagal Theory–Informed Therapies (PVTT) are trauma treatment approaches based on the polyvagal theory developed by Stephen Porges (2011, 2017). They integrate an understanding of the autonomic nervous system’s hierarchical responses to threat and safety into therapeutic interventions, aiming to restore nervous system flexibility, emotional regulation, and a sense of safety. Foundational Principles Polyvagal theory posits
- [Psychodrama for Trauma (Moreno), PBSP Psychomotor (Albert Pesso), and Contemporary Uses (van der Kolk)](/docs/evidence-based-trauma-therapies-and-models/psychodrama-for-trauma-moreno-pbsp-psychomotor-albert-pesso-and-contemporary-uses-van-der-kolk/): Overview Psychodrama and PBSP (Pesso Boyden System Psychomotor) are experiential, enactment-based therapies that use role play, embodied movement, and structured scenes to repair attachment ruptures, rework traumatic memories, and restore agency. Bessel van der Kolk has highlighted these modalities—especially PBSP “structures”—as powerful for trauma integration when cognitive talk therapy stalls. Foundational principles Action + Embodiment:
- [Somatic and Sensorimotor Psychotherapy](/docs/evidence-based-trauma-therapies-and-models/somatic-and-sensorimotor-psychotherapy/): Somatic and Sensorimotor Psychotherapies represent trauma-informed approaches explicitly designed to engage and resolve trauma at the bodily level. These methodologies integrate principles of neuroscience, trauma theory, and somatic psychology to address physiological symptoms and somatic memory of trauma effectively. Foundational Principles Somatic psychotherapies view trauma as fundamentally embedded within the nervous system and body tissues,
- [Trauma-Informed Stabilization Treatment (TIST)](/docs/evidence-based-trauma-therapies-and-models/trauma-informed-stabilization-treatment-tist/): Overview Trauma-Informed Stabilization Treatment (TIST), developed by Dr. Janina Fisher, is a phase-oriented, parts-based model designed for individuals with complex trauma, dissociation, and self-destructive behaviors. TIST blends structural dissociation theory, sensorimotor psychotherapy, and mindfulness into a practical, safety-first approach that helps clients develop internal stability before direct trauma processing. Foundational Principles Parts Work as Stabilization:
- [Trauma-Sensitive Yoga (TSY) / Trauma-Informed Yoga](/docs/evidence-based-trauma-therapies-and-models/trauma-sensitive-yoga-tsy-trauma-informed-yoga/): Overview Trauma-Sensitive Yoga (TSY) is an evidence-supported, body-based intervention adapted specifically for trauma survivors. Originating at the Trauma Center in Brookline, MA (Bessel van der Kolk, David Emerson, Jenn Turner), TSY is rooted in hatha yoga but modified to prioritize choice, safety, and interoceptive awareness over performance or achievement. It is now practiced globally in

## Key Concepts
- **Adaptive Information Processing (AIP)** — Francine Shapiro's model underpinning EMDR: unprocessed traumatic memories remain stored in dysfunctional, state-dependent form and drive present symptoms until reprocessed.
- **Amygdala** — Subcortical structure central to threat detection and fear conditioning; hyperactive in PTSD and drives implicit trauma responses.
- **Attachment Theory** — Bowlby–Ainsworth framework describing how early caregiver relationships shape internal working models of self, others, and safety across the lifespan.
- **Autonomic Nervous System (ANS)** — The branch of the peripheral nervous system regulating involuntary physiology; its sympathetic and parasympathetic branches organize trauma survival responses.
- **Complex PTSD (C-PTSD)** — ICD-11 diagnosis following prolonged, inescapable trauma — PTSD symptoms plus persistent disturbances in self-organization: emotion regulation, self-concept, and relationships.
- **Deep Brain Reorienting (DBR)** — Frank Corrigan's brainstem-level psychotherapy that targets pre-affective orienting and shock responses before cortical narrative processing.
- **Developmental Trauma** — Chronic adversity during childhood — abuse, neglect, disrupted attachment — that shapes neurodevelopment and produces symptoms distinct from adult-onset PTSD.
- **Dissociation** — A disruption of the normal integration of consciousness, memory, identity, or perception; ranges from mild detachment to structural dissociation of the personality.
- **Dorsal Vagal Shutdown** — Polyvagal state of collapse, immobilization, and numbing mediated by the unmyelinated dorsal vagus when threat is inescapable.
- **Dysregulation** — Loss of the capacity to keep affect, arousal, or behavior within adaptive limits — a core mechanism across trauma disorders.
- **EMDR** — Eye Movement Desensitization and Reprocessing — a phased, evidence-based trauma therapy that uses bilateral stimulation to reprocess pathogenic memory networks.
- **HPA Axis** — Hypothalamic-Pituitary-Adrenal axis — the neuroendocrine stress system releasing cortisol; chronically dysregulated in trauma survivors.
- **Internal Family Systems (IFS)** — Richard Schwartz's parts-based psychotherapy: the mind is a system of protective and wounded parts around an undamaged core Self capable of leading healing.
- **Intergenerational Trauma** — Transmission of trauma effects across generations via epigenetic, attachment, and social pathways — the descendants of survivors carry measurable risk.
- **Neurosequential Model of Therapeutics (NMT)** — Bruce Perry's developmentally informed clinical approach that sequences interventions from brainstem regulation upward through relational and cortical work.
- **Polyvagal Theory** — Stephen Porges's theory that the mammalian vagus nerve mediates three hierarchical response states — ventral safety, sympathetic mobilization, dorsal shutdown.
- **PTSD** — Post-Traumatic Stress Disorder — a diagnosable condition of intrusive re-experiencing, avoidance, negative cognition/mood, and hyperarousal after trauma.
- **Somatic Experiencing** — Peter Levine's body-oriented approach that discharges thwarted survival energy by tracking sensation and pendulating between activation and settling.
- **Structural Dissociation** — Van der Hart, Nijenhuis & Steele's theory: trauma splits the personality into apparently normal (ANP) and emotional (EP) parts, in primary, secondary, or tertiary form.
- **Toxic Stress** — Prolonged activation of the stress response in the absence of buffering relationships; the ACE study links it to lifelong physical and mental illness.
- **Triphasic Model** — Judith Herman's three-phase treatment framework — Safety and Stabilization, Trauma Memory Processing, Integration and Rehabilitation — the international standard.
- **Ventral Vagal State** — Polyvagal state of social engagement and calm connection mediated by the myelinated ventral vagus — the physiological signature of felt safety.
- **Window of Tolerance** — Dan Siegel's model of the arousal band inside which the nervous system can integrate experience; trauma narrows it and pushes people into hyper- or hypoarousal.

_Total articles indexed: 50._