Memory › Paramnesia (Distortion of Memory) › Distortion of Recognition › False Reconnaissance

Capgras Syndrome

Named after the French psychiatrist who first described this specific delusional misidentification.

Capgras syndrome is the fixed, delusional belief that a person close to the individual, often a family member, has been replaced by an identical-looking double or impostor. Unlike a more general negative misidentification, this is a specific, elaborated, and firmly held delusion about substitution, not simply a failure to feel that someone is familiar.

This has traditionally been considered the most specific and elaborated form of negative misidentification, distinguished by the addition of a fully formed delusional explanation — that an identical double or impostor has taken the real person's place — rather than a more diffuse or general sense that someone is a stranger.

Recognition features

• A fixed, delusional belief that a specific, usually close, person has been replaced by an identical-looking double or impostor
• The physical resemblance is typically acknowledged as perfect or near-perfect; the person insists the double is simply not, in some essential way, the real individual
• Occurs in schizophrenia and in dementia
• May be accompanied by significant distress, suspicion, or even hostility directed at the person believed to have been replaced

Eliciting it at interview

• Ask directly, where negative misidentification is suspected, whether the person believes anyone close to them has been replaced by a look-alike or impostor, and explore the belief's history and firmness
• Assess the emotional response to the believed substitution, since this can range from mild puzzlement to marked fear or hostility, with implications for safety and family relationships
• Consider both psychotic and organic (particularly dementia-related) causes, and assess accordingly, since the underlying management differs

Distinguishing features

• Differs from ordinary negative misidentification in the specific, elaborated delusional explanation involving a substituted double, rather than a more general and less structured sense of unfamiliarity
• Differs from prosopagnosia (a face-recognition impairment sometimes discussed alongside receptive language disorders), in that here the person can recognise the face perfectly well but denies the underlying identity is genuine
• The specific, named delusional content (an identical double has replaced someone) distinguishes this from other, more variable forms of misidentification

Common misconceptions

• That Capgras syndrome reflects a face-recognition problem; the person is generally able to recognise the face accurately, but rejects the associated identity at a deeper level
• That the belief is easily corrected by reassurance or by pointing out the resemblance; like other delusions, it is typically fixed and does not respond to counter-evidence

Related phenomena

False Reconnaissance · Distortion of Recognition

Related syndromes

Fregoli Syndrome · Syndrome of Intermetamorphosis · Syndrome of Subjective Doubles · Reduplicative Paramnesia

Diagnostically relevant to

Schizophrenia (links open the DSM-5 Learning Lab)

Practice this

A woman with schizophrenia insists, with complete conviction, that her husband has been replaced by an identical-looking impostor, acknowledging he looks exactly like her real husband but maintaining he is "not really him." She becomes hostile toward him as a result. What is this? · A man with dementia becomes convinced his daughter, who visits him daily and whom he agrees looks exactly like his real daughter, is "an impostor sent to trick him," and asks staff to call the police each time she visits. Before revealing the answer: is this Capgras syndrome? · A patient fails to recognise someone they genuinely know. Before revealing the answer, decide what distinguishes false reconnaissance from Capgras syndrome. · You suspect a patient may hold a Capgras-type delusion about a family member. Which single question would most usefully help confirm this specific pattern, rather than a more general sense of unfamiliarity? · A patient with Capgras syndrome fully acknowledges that the person in front of them looks exactly like their spouse, yet still insists it isn't really them. Why is this combination the defining feature of the syndrome, rather than a contradiction?

Illustration

A 75-year-old woman with dementia becomes convinced that her husband of fifty years has been replaced by an impostor who looks and sounds exactly like him but who, she insists, is definitely not really him, and she becomes anxious and unwilling to let this "impostor" near her, even as he remains patiently and gently reassuring throughout each occurrence.

References

• Casey, P. & Kelly, B. (2019). Fish's Clinical Psychopathology, 4th ed. Ch. 5, 'Disorders of Memory'.