Psychological Trauma

Psychological trauma is defined as the emotional and physiological response to an event or series of events that overwhelm an individual's capacity to integrate the experience and maintain a sense of safety and coherence. Unlike everyday stress, trauma fundamentally alters the person's perception of self, others, and the world. Several types of trauma are distinguished: single-event trauma (an accident, an assault, a natural disaster), complex or developmental trauma (repeated and chronic exposure to traumatic experiences, often in childhood, such as abuse or neglect), and intergenerational trauma (transmission of trauma effects across generations, as in Holocaust or genocide survivors).

The neurobiological impact of trauma is profound and measurable. The amygdala — the brain's alarm center — becomes hyperactivated, generating exaggerated fear responses and a constant state of hypervigilance. The hippocampus, responsible for contextual and narrative memory, may decrease in volume, contributing to the fragmentation of traumatic memories — victims experience flashbacks and intrusive recollections rather than coherent narratives. The hypothalamic-pituitary-adrenal (HPA) axis, which regulates the stress response, becomes dysregulated, altering cortisol levels and producing systemic effects on physical health. Stephen Porges proposed polyvagal theory, which describes three states of the autonomic nervous system: social engagement (ventral vagal), fight-or-flight (sympathetic), and immobilization or collapse (dorsal vagal), offering a framework for understanding traumatic responses beyond the classic fight-or-flight model.

Post-traumatic stress disorder (PTSD) is the clinical diagnosis associated with trauma. The DSM-5 requires exposure to a traumatic event and the presence of symptoms in four clusters: intrusive memories (flashbacks, nightmares), avoidance (of places, people, or thoughts associated with the trauma), negative alterations in cognition and mood (guilt, shame, loss of interest), and hyperarousal (insomnia, irritability, exaggerated startle response). The ICD-11 added the diagnosis of complex PTSD, originally proposed by Judith Herman (1992), which additionally includes difficulties in emotional regulation, negative self-concept, and disturbed interpersonal relationships — recognizing that chronic trauma, especially in childhood, produces broader effects than classic PTSD.

Therapeutic approaches to trauma are diverse and reflect the complexity of the phenomenon. EMDR (Eye Movement Desensitization and Reprocessing), developed by Francine Shapiro, uses bilateral stimulation to facilitate processing of traumatic memories. Prolonged exposure and cognitive processing therapy (CPT) are evidence-based interventions that help patients confront and reprocess traumatic experiences. Bessel van der Kolk has championed a body-based approach, arguing that "the body keeps the score" — that trauma is stored somatically and requires interventions that address bodily sensations, such as sensorimotor therapy, trauma-adapted yoga, and expressive arts.

The trauma-informed care perspective has transformed practice in mental health, education, and social services. This perspective does not ask "what's wrong with you?" but "what happened to you?" — recognizing that many mental health problems, addictions, and social difficulties have traumatic roots. Core principles include safety, trustworthiness, peer support, collaboration, and empowerment. Rachel Yehuda's research on the epigenetics of trauma has demonstrated that traumatic stress can produce epigenetic changes that are transmitted to the next generation, providing a biological basis for the concept of intergenerational trauma and opening new avenues for understanding and treatment.