64 有些嚴重型的憂鬱症患者，會出現一種認為世界上一切事物都已不存在或不真實的妄想（nihilistic delusion），此現象稱為：

Cotard’s syndrome déjà vu Anton’s syndrome factitious disorder

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The Cotard delusion or Cotard's syndrome or Walking Corpse Syndrome^[1]is a rare neuropsychiatric disorder in which people hold a delusional belief that they are dead (either figuratively or literally), do not exist, are putrefying, or have lost their blood or internal organs. In rare instances, it can include delusions of immortality.^[2]

^{ANTON'S SYNDROME IS THAT THE PERSON IS BLIND BUT DID NOT REALIZE THAT THEY ARE BLIND. THEY CAN STILL SEE THINGS AND DESCRIBE THINGS IN THE WORLD CREATED BY THEIR IMAGINATION!}