With his mentor, Paul Sérieux (1864–1947), he contributed on psychiatric publications such as Les Folies raisonnantes (1909) and Les Psychoses à base d'interprétations délirantes. With Sérieux, he described a type of non-schizophrenic, paranoid psychosis referred to as Délire d’interprétation de Sérieux et Capgras.
Capgras delusion was described in 1923 in a study published by Capgras and his intern Jean Reboul-Lachaux, titled L'illusion des "sosies" dans un délire systématisé chronique. This disorder is defined as a delusion that a close relative or friend has been replaced by an impostor.
- Postel J, Allen DF. Joseph Capgras (1873-1950). Psychopathology 1994;27:121–122, doi:10.1159/000284857.
- Sérieux P, Capgras J, Les Folies rasonnantes, J.-F. Alcan, 1909.
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