MENTAL MODEL · M3846

Fregoli Delusion

Learn & MetacognitionHigh supportCognitive Science

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Updated 2026-08-01

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INTRODUCTION

English translation pending.

CORE DEFINITION

The Fregoli delusion, first described by Courbon and Fail and named after an Italian actor famous for changing his appearance rapidly, is the delusional belief that a single familiar person takes on the appearance of various strangers. It belongs to the delusional misidentification syndromes, alongside Capgras delusion, and is associated with neurological damage, particularly to the right hemisphere, and with conditions such as schizophrenia. The key qualifier is that it is a delusion rather than a perceptual error: faces are recognized, but the identity attached to them is systematically wrong.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

- Pattern check: Ask whether a persistent belief about others' intentions rests on evidence or on one organizing assumption. - Cultural diagnosis: Use it as a model for how a low-trust organization reads unrelated events as coordinated attacks. - Clinical triage: Flag fixed misidentification beliefs for neurological and psychiatric assessment rather than argument.

anchor

Anchor fast decisions

Face recognition and the feeling of familiarity are handled by partly separate pathways, so damage or dysfunction can leave the face perceived while the accompanying identification signal is mismatched. When the system must reconcile a familiar feeling with the wrong face, it produces a coherent explanation, and in a mind already disposed to persecution that explanation takes the form of disguise. The delusion then becomes self-confirming, since each new stranger is absorbed as further evidence of the same hidden agent.

MINIMUM ACTION

In progress 0/1

Practice this model in one real situation:

Note when a belief about being targeted rests on one repeated identity rather than on separate evidence. 2. Ask what the belief would predict and whether it can be falsified at all. 3. In an organization, trace the actual decision chain behind an unpopular policy. 4. Treat fixed misidentification beliefs as a clinical signal rather than a topic for debate. 5. Record disconfirming cases instead of absorbing them into the same explanation.

Check to track your progress (stored locally)

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Source support: Explicit

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en.wikipedia.orghttps://en.wikipedia.org/wiki/Fregoli_delusionZH · Explicit
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