The SDI Model: Stabilization, Disconfirmation, Integration. Contact × Safety × Time as a Common Mechanism of Change in Anxiety Disorders, Phobias, and OCD

Psychotherapy for anxiety-related conditions is described in the vocabulary of many schools: exposure, habituation, extinction, inhibitory learning, emotional processing, and memory reconsolidation. This paper proposes the SDI Model (Stabilization–Disconfirmation–Integration), a conceptual framework that treats these descriptions as accounts of a single process: the nervous system learns to respond differently to a stimulus that previously triggered fear, avoidance, or rituals. The model specifies three necessary conditions for this change: contact with the stimulus, a framework of safety, and sufficient time (summarized as Contact × Safety × Time). Under these conditions, threat expectancies are disconfirmed, new learning occurs, and the experience is integrated. The model further proposes a clinical principle of the precise stimulus: change is accelerated when contact targets the specific image, thought, phrase, or scene that actually triggers the response, rather than the general label of the fear. The framework is grounded in the inhibitory learning and expectancy violation literature and is offered as a clinically oriented integrative model. Its applications to phobias, panic, and obsessive-compulsive disorder are outlined, and directions for empirical testing are proposed.