Capgras Syndrome is a rare disorder in which a person believes that a close friend or family member has been replaced by an imposter who is identical to the original. This delusion is also known as "impostor syndrome" or " Capgras' delusion." It is named after Joseph Capgras, a French psychiatrist who first described this condition in 1923.

People with Capgras Syndrome are typically able to recognize the physical features of their loved ones, but they claim that the person's inner essence or identity has been replaced by an imposter. They may believe that the impostor is a duplicate, a robot, or an alien, and they often become agitated or suspicious when confronted with their loved one's presence.

The exact cause of Capgras Syndrome is not known, but it is thought to be related to brain damage or dysfunction in certain areas of the brain that are involved in face recognition and emotional processing. It can occur as a result of various neurological conditions, such as dementia, stroke, epilepsy, or head injury, or it can be a symptom of certain psychiatric disorders, such as schizophrenia.

Treatment for Capgras Syndrome typically involves a combination of medication and psychotherapy to address the underlying cause of the disorder. Antipsychotic medications may help reduce delusional thinking, while cognitive-behavioral therapy can help individuals learn to cope with their symptoms and improve their relationships with loved ones.