Dissociation: Depersonalisation and Derealisation

Dissociative disorders -- and in particular depersonalisation and derealisation -- are among the most unsettling psychological experiences a person can have. That sudden feeling of being detached from oneself, of watching your own life as if through a pane of glass, of perceiving the world around you as unreal, artificial, distant. People who experience these episodes often describe them with recurring metaphors: "like in a dream," "like I'm a robot," "as if nothing is real."

Dissociation is an adaptive mechanism the brain uses when facing a psychological threat perceived as insurmountable. In cognitive-behavioural therapy (CBT), it is understood as a protective response that, when it becomes chronic or disproportionate, transforms into a disorder in its own right. Understanding this mechanism is the first step towards regaining control.

This article explores dissociative disorders from a clinical and therapeutic perspective: what they are, why they occur, how they manifest, and above all how CBT can effectively treat them.

What Is Dissociation?

Dissociation is a disruption in the usual integration of consciousness, memory, identity, perception or behaviour. Under normal circumstances, these psychological functions are seamlessly integrated: you know who you are, where you are, what you are doing, and you feel connected to your experience. Dissociation breaks this integration.

The dissociation spectrum ranges from the mundane to the pathological. Everyone has experienced a mild form of dissociation: driving on "autopilot" and arriving at your destination without remembering the journey, being so absorbed in a film that you lose track of time, mentally "checking out" during a boring conversation. These experiences are normal and do not constitute a disorder.

Dissociation becomes problematic when it is intense, frequent, involuntary, and causes significant distress or impaired daily functioning.

The Dissociative Continuum Model

Research in psychopathology proposes a continuum model (Bernstein & Putnam, 1986):

At one end, normal dissociative experiences: absorption, daydreaming, automatisms. In the middle, transient episodes of depersonalisation and derealisation, often linked to stress or fatigue. At the other end, severe dissociative disorders: dissociative identity disorder (formerly "multiple personality"), dissociative amnesia, dissociative fugue.

This article focuses on the middle of the spectrum -- depersonalisation and derealisation -- because these are the most common and least understood forms by the general public.

Depersonalisation: When You Feel Like a Stranger to Yourself

Depersonalisation is an experience of detachment from oneself -- one's thoughts, emotions, body and actions. The person has the feeling of being an outside observer of their own life.

How It Manifests

The descriptions my patients give of depersonalisation follow recurring themes:

Emotional detachment. "I know I should be sad / happy / angry, but I feel nothing. It's as if my emotions are behind glass." Emotions are recognised intellectually but not felt.

Sense of bodily unreality. "My hands don't feel like mine." "When I look in the mirror, I don't recognise myself -- well, I know it's me, but it doesn't feel real." The body is perceived as foreign, like a shell inhabited by a disconnected mind.

Feeling like an automaton. "I do things mechanically, but I'm not really there." "It's as if someone else is piloting my body." Actions are carried out but without a sense of will or presence.

Altered time perception. Time seems to stretch or compress. Recent events seem distant. Memory works, but memories are stripped of their emotional charge -- as if they belonged to someone else.

What Depersonalisation Is NOT

Depersonalisation must be distinguished from psychosis. The depersonalised person knows they are real. They know their experience is abnormal. They maintain contact with reality -- which is precisely what makes it so anxiety-inducing. The psychotic person, on the other hand, does not question their experience: they believe it to be true. This distinction is fundamental for diagnosis and for reassuring patients terrified at the idea of "going mad."

Derealisation: When the World Seems False

Derealisation is the equivalent of depersonalisation, but turned outward. It is the world that seems unreal, artificial, distant.

Typical Manifestations

Altered perception of the environment. "Things around me seem flat, like a theatre set." "Colours are dull, or conversely too vivid." "Sounds arrive as if muffled, as if through a wall."

Glass or fog sensation. This is the most common metaphor: "It's like I'm looking at the world through a pane of glass." "There's a veil between me and reality." "Everything seems distant, even the people right in front of me."

Altered perception of loved ones. "My partner is talking to me, I can see them, I can hear them, but they seem unreal." "My children are playing in front of me and I feel like I'm watching a film." This dimension is particularly painful because it touches the most intimate relationships.

Perceptual distortions. Some people report changes in the size of objects (micropsia, macropsia), altered depth of field, or a sensation that time has stopped.

Why the Brain Dissociates: The Protective Mechanism

Dissociation is not a random malfunction. It is a protective mechanism -- a "safety valve" the brain activates when the emotional load exceeds processing capacity.

The Neurobiological Model

Neuroimaging research (Sierra & Berrios, 1998; Phillips et al., 2001) has shown that during depersonalisation episodes, the prefrontal cortex (reasoning, control) is hyperactivated, while the amygdala (emotions, fear) and the insula (body awareness) are hypoactivated. In other words, the brain "turns off" the emotional centres and "turns up the volume" on rational control.

This is the neurological equivalent of a fuse blowing to protect the circuit. Facing an emotion perceived as dangerous -- panic, terror, unbearable emotional pain -- the brain cuts access to emotions. The person remains conscious and functional, but they no longer feel.

Common Triggers

Acute or chronic stress. This is the most frequent trigger. Prolonged stress -- professional, relational, financial -- can gradually induce a chronic dissociative state. The brain, subjected to permanent overload, eventually "disconnects" to survive.

Anxiety attacks. Many people first discover depersonalisation during a panic attack. The intensity of the anxiety triggers dissociation as a protective mechanism. Unfortunately, the dissociation itself is so disorienting that it generates a new wave of anxiety, creating a vicious circle.

Trauma. Dissociation is a classic trauma response. Facing a traumatic event -- assault, accident, violence -- the brain can "cut the emotional circuit" to allow the person to survive. In some individuals, this adaptive response becomes chronic and persists long after the threat has gone.

Sleep deprivation and exhaustion. Chronic sleep deprivation impairs prefrontal cortex and amygdala function, facilitating dissociative episodes.

Substances. Cannabis, certain psychedelic drugs, and even excess caffeine can trigger or worsen dissociation. Cannabis is a particularly common trigger: many patients report that their first depersonalisation episode occurred after using cannabis, sometimes even a single use.

The Vicious Circle of Chronic Depersonalisation

In CBT, the chronicisation of depersonalisation is modelled as a four-step vicious circle (Hunter, Phillips, Chalder, Sierra & David, 2003):

Step 1: The initial episode. Intense stress, a panic attack or trauma triggers a first depersonalisation/derealisation episode. The experience is frightening but transient.

Step 2: Catastrophic interpretation. The person interprets the episode dramatically: "I'm going mad." "My brain is damaged." "I'm losing control of my mind." "I'll never be normal again." These interpretations generate considerable anxiety.

Step 3: Hypervigilance. The person begins to constantly monitor their mental state. "Do I feel real? Does the world seem normal?" This constant surveillance -- this attentional focus on dissociative sensations -- mechanically amplifies them. It is the same phenomenon as when you focus on a noise: it seems to become louder.

Step 4: Maintaining behaviours. The person develops checking behaviours (pinching themselves to "verify they are real"), avoidance (avoiding situations that might trigger an episode), and reassurance-seeking (googling their symptoms, asking loved ones "do I seem normal to you?"). These behaviours maintain the attentional focus on symptoms and prevent natural extinction.

And the circle turns. An episode that could have remained isolated transforms into a chronic disorder, not because the neurobiological mechanism is irreversible, but because the person's cognitive and behavioural reactions keep it active.

The CBT Approach to Dissociative Disorders

CBT is the first-line treatment for depersonalisation/derealisation disorder (Hunter et al., 2005; Gentile et al., 2014). The approach directly targets the vicious circle described above.

Psychoeducation: Normalising the Experience

The first therapeutic objective is to reduce fear. The vast majority of patients arrive in consultation convinced they are losing their mind, that they have a serious neurological disease, or that their condition is irreversible. None of these beliefs are founded.

The CBT therapist explains the dissociation mechanism: it is a protective brain response, not a pathological malfunction. The brain is doing exactly what it is programmed to do -- it is protecting against emotional overload. The problem is not that the mechanism exists, but that it activates too easily or remains active when the threat has passed.

This normalisation often produces significant relief. "You are not going mad. Your brain is functioning correctly -- too well, in fact. It is protecting you in a way that is no longer necessary."

Restructuring Catastrophic Interpretations

Catastrophic thoughts about dissociation are identified and worked on:

• "I'm going mad" --> "Dissociation is the opposite of madness: it shows my brain has active protective mechanisms."

• "My brain is damaged" --> "Dissociation is functional, not lesional. No structural damage has been identified in neuroimaging studies."

• "I'll never be normal again" --> "Dissociation episodes naturally decrease when stress decreases and when maintaining mechanisms are interrupted."

• "I'm losing control" --> "I retain control of my actions, my memory and my judgement. What I temporarily lose is the emotional quality of my experience."

Reducing Hypervigilance

The patient learns to redirect their attention away from internal monitoring. Several techniques are used:

Attentional reattribution. When the patient catches themselves checking "Do I feel real?", they learn to deliberately redirect attention to a concrete external task. The goal is not to fight the sensation, but to stop feeding it with attention.

Engagement in absorbing activities. Activities that require active concentration -- sport, conversation, manual work, games -- naturally reduce dissociation because they mobilise attention outward.

Sensory grounding. Grounding techniques use the five senses to bring the person into the present moment: holding an ice cube, smelling a strong essential oil, listening to a specific sound, touching a contrasting texture. These sensory stimulations "remind" the brain that it is connected to a body and a real environment.

Exposure to Avoided Situations

Many patients avoid situations they associate with dissociation: public places, bright spaces, screens, emotional conversations, sometimes even looking in a mirror. These avoidances are treated through gradual exposure, as with any anxiety disorder.

Treating Stress and Underlying Causes

Dissociation is a symptom, not a cause. For lasting treatment, one must address what fuels the emotional overload: chronic anxiety, professional stress, relational conflicts, untreated traumas. Depending on the case, this involves work on stress management, emotional regulation, assertiveness, or trauma processing (traumatic narrative exposure, EMDR as a complement to CBT).

Reducing Aggravating Factors

The therapist helps the patient identify and reduce factors that fuel dissociation: sleep deprivation, cannabis or other substance use, overwork, social isolation, screen overuse, sedentariness. These factors do not cause dissociation, but they lower the triggering threshold.

Depersonalisation and Anxiety Attacks: The Common Duo

Depersonalisation very often accompanies panic attacks. The mechanism is as follows: anxiety skyrockets, the sympathetic nervous system goes into overdrive, and the brain -- overwhelmed by the intensity of the activation -- triggers dissociation to "cushion the shock."

The problem is that the depersonalisation is perceived as an additional frightening symptom, which intensifies the panic, which reinforces the dissociation. A circular escalation ensues.

In CBT, this dynamic is treated as a whole: panic is not treated separately from dissociation. The patient learns that both are faces of the same mechanism, and that techniques reducing anxiety (breathing, cognitive restructuring, interoceptive exposure) also reduce dissociation.

What You Can Do Right Now

If you experience episodes of depersonalisation or derealisation, here are concrete strategies:

Stop searching for answers on the internet. Medical "doomscrolling" -- reading forums, catastrophist articles, anxiety-inducing testimonials -- is fuel for the vicious circle. Each search feeds hypervigilance and catastrophic interpretation.

Practise sensory grounding. When an episode occurs, engage your senses: name 5 things you can see, 4 you can touch, 3 you can hear, 2 you can smell, 1 you can taste. This simple technique brings attention back into the body and the present.

Maintain your activities. Avoidance reinforces dissociation. Continue going out, working, seeing people, even when the experience feels "unreal." The brain recalibrates faster when receiving varied stimulation.

Sleep. Sleep is the best neurological regulator. Sleep deprivation is one of the most underestimated aggravating factors of dissociation.

Reduce stimulants and cannabis. Cannabis in particular is a recognised depersonalisation trigger. If you use it and experience dissociation, the first measure is to stop consumption.

Accept the symptom without fighting it. The more you fight the sensation of depersonalisation, the more you feed it. Paradoxical acceptance -- "Yes, I feel a bit unreal, it's unpleasant but it's not dangerous, and it will pass" -- is more effective than resistance.

The Prognosis: Good News

The majority of depersonalisation/derealisation disorders respond well to treatment. Longitudinal studies show that symptoms diminish significantly with appropriate care, and that complete remission is common when the underlying stress is treated and maintaining vicious circles are interrupted.

The brain that has learned to dissociate can learn not to -- or at least to do so only in situations that truly warrant it. Neuroplasticity works in your favour.

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