In Changing the Odds: A New Understanding of PTSD, Dr. Ivan Gulas draws on more than fifty years of clinical practice-spanning psychoanalytic training, cognitive-behavioral modalities, neuropsychology, and brain imaging-to introduce a unifying framework that reshapes how PTSD can be understood, treated, and successfully navigated.
Through vivid narrative, clinical insight, and neuroscience, Dr. Gulas argues that trauma does more than produce fear. It shatters the brain's internal probability-assessment system-the quiet, invisible mechanism that continuously evaluates risk and allows people to live without constant terror. Trauma forces an instant, catastrophic recalibration: the brain, proven wrong in a moment of mortal danger, overcorrects toward hypervigilance and constant alarm.
The result is the condition we call PTSD: not a collection of symptoms, but a disorder of miscalibrated threat assessment affecting memory, emotion, behavior, and the body's survival systems. Through this lens, intrusive memories, avoidance, hypervigilance, triggers, dissociation, and emotional numbing become understandable responses to a system struggling to avoid ever being "wrong" about danger again.
This book is neither a treatment manual nor a self-help guide. Instead, it opens a fiercely original window onto the unseen mechanisms that shape trauma and recovery. It explains why certain therapeutic approaches work, why others falter, and what recovery truly looks like: the gradual restoration of trust in a world that once proved catastrophically unsafe. Written for clinicians, trauma survivors, and families, Changing the Odds offers clarity, hope, and a powerful new way of understanding the path to healing.
Gulas, Ivan: - Dr. Ivan Gulas brings a dual perspective to trauma, as both survivor and clinician. A childhood survivor of the 1956 Hungarian Revolution, he personally understands the lasting impact of trauma and the path to recovery. These experiences, and his later anxiety reactions, sparked a lifelong inquiry into how trauma reshapes the brain's systems of threat assessment and emotional regulation.Dr. Gulas, Ph.D., ABPP, is a Board-Certified Clinical Psychologist who completed his graduate training at Dartmouth College and Ohio University and his clinical internship at Beth Israel Hospital / Harvard Medical School. For over 20 years, he held a faculty appointment at Harvard Medical School and served as an attending staff member at several Harvard-affiliated medical centers and private inpatient hospitals, while maintaining a private practice in Boston. His clinical work spans more than fifty years, beginning with Vietnam veterans in 1973, before PTSD was formally recognized as a diagnosis in 1980.His clinical practice encompassed a broad range of therapeutic modalities. Starting from psychoanalytic and psychodynamic approaches, his work evolved to include Rational-Emotive Therapy, Cognitive-Behavioral Therapy, Dialectical Behavior Therapy, hypnosis, and biofeedback. Later, he expanded his expertise to neuropsychological assessments and consulting.In the 1990s, Dr. Gulas pioneered access to brain imaging technology by designing and deploying the first mobile dedicated Brain SPECT imaging unit for clinical observation. SPECT research has since helped identify PTSD as a whole-person phenomenon affecting cognition, emotion, and behavior and altered brain functioning patterns.Drawing on decades of clinical experience evaluating and treating trauma survivors, Dr. Gulas presents an original unifying framework for understanding what PTSD is, how it develops, why it persists, and what recovery realistically entails.
