There are a variety of conditions in which a patient believes that another person or that the person himself/herself have been substituted or taken on a different form. The types depend on delusion with or without hallucination.
Parameters:
(1) physical appearance
(2) psychological identity
(3) role of patient
Physical Appearance
Identity
Patient's Role
Syndrome
same
changed
observer
Capgras
changed
same
observer
Fregoli
changed
changed
observer
intermetamorphosis
doubles
NA
observer
subjective double of the Capgas type
double is an imposter of the patient
NA
observer
autoscopic double
same
changed
patient has changed
reverse Capgras
changed
same
patient has changed
reverse Fregoli
double
NA
patient is the imposter
reverse subjective double
changed
changed
patient involved
reverse intermeta-morphosis
The misidentification syndrome may underly Kafka's The Metamorphosis.
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