[4] His book Introduction à la Métapsychique Humaine (1926) attacked the spiritualist hypothesis and defended an animist position of creative forces similar to Henri Bergson.

Sudre interpreted mental and physical phenomena of mediums as evidence for clairvoyance and psychic forces.

[8] Professor John Cohen in the New Scientist for a review of Treatise on Parapsychology (1960) disputed Sudre's belief that clairvoyance had been established by science but praised the book for "demolishing" the spiritualist hypothesis of mediumship.

Cohen noted that the book "ranks among the very best of its kind that have appeared on either side of the Atlantic".

In a review for Nature he noted that Sudre was credulous in accepting materializations and psychic photographs as genuine.