Dissociation
An educational exploration of dissociation, its everyday expressions, history, and relationship to overwhelming experience.
By Iveta Upeniece
What Dissociation Is
Dissociation is a psychological defense mechanism in which consciousness, memory, identity, or perception becomes separated from the normal integrated flow of experience. It creates distance from something overwhelming — a moment, a memory, or the body — when there is no physical way to escape it. What cannot be fled is, instead, exited from within.
The range is wide. At its mildest it can look like daydreaming, losing oneself in a book, or checking out of a boring conversation. Further along the spectrum it can involve depersonalization, derealization, and gaps in memory for traumatic periods. In chronic and severe forms, prolonged childhood dissociation can contribute to fragmentation of identity.
How It Can Appear in Daily Life
Dissociation often goes unnamed. It can look like completing an entire task — driving, cooking, or sitting through a difficult conversation — with no memory afterward. It can look like emotional flatness when strong feeling would be expected, a persistent sense of unreality, or speaking about one’s own experience as though it happened to someone else.
These experiences are not signs of weakness or unusual fragility. They can be understood as the nervous system creating distance when neither fighting nor fleeing was possible.
History of the Concept
The roots of the concept lie in late nineteenth-century France and the study of hysteria, an early lens for understanding trauma before the modern use of that word. Pierre Janet, a French philosopher and psychiatrist working at the Salpêtrière hospital in Paris, systematically developed the concept in his 1889 doctoral thesis, L’automatisme psychologique. He described psychological disaggregation: memories, sensations, or functions splitting off from the main stream of consciousness and continuing as isolated psychic systems outside awareness.
Janet worked in dialogue with Charcot, Freud, and Breuer. Freud developed the language of repression and conflict, while Janet kept dissociation as his central model, describing a mind that can fracture under overwhelming pressure rather than simply hiding forbidden material.
Janet’s model was overshadowed for much of the twentieth century by psychoanalysis and biological psychiatry, surviving mainly in the literature on multiple personality. It resurfaced in the 1970s and 1980s through recognition of chronic childhood abuse and the study of Vietnam veterans, contributing to the formal recognition of PTSD in DSM-III in 1980. Judith Herman’s Trauma and Recovery and the work of Bessel van der Kolk and Onno van der Hart helped renew its place in trauma studies.
Today dissociation is understood within a broader model of threat responses. Fight and flight are mobilized responses; dissociation, alongside freeze, can arise when neither fighting nor fleeing is possible. The mind’s remaining recourse is to separate awareness from what cannot otherwise be survived.
A Film That Shows It
Jacob’s Ladder (1990, directed by Adrian Lyne) is often discussed in clinical and trauma-literature contexts for rendering altered time, reality, and identity from inside a traumatized mind.
A gentler option is The Tale (2018, directed by Jennifer Fox), which portrays a woman confronting a distorted childhood memory and the distance between an adult narrating the past and the child who lived it.