Trance
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
A state of apparent 'clairvoyance' that develops in some individuals during deep hypnosis or twilight hysterical states. The article explains that these phenomena are not supernatural abilities but rather the awakening of dormant memories, heightened sensory perception, and lucky guesses.
Encyclopedia article (1928–1936)
TRANCE, a state of so-called 'clairvoyance' that develops in some individuals in deep degrees of hypnosis or in twilight hysterical states. Persons in a trance appear to predict the future or describe distant events happening at the moment of the trance as if they were seeing them themselves. Unbiased research has proven with certainty that in such states there is no manifestation of any special ability, but rather the awakening of previously inactive old memory traces, a temporary heightening of the ability to perceive certain sensations, and occasional lucky guesses. Much more often, however, in cases classified as trance, there is deception - this is the case with most spiritualist 'mediums'. The latter, besides individual exposures, is also proven by the fact that trance states particularly easily arose in a certain environment created by superstition, passion for strong sensations and sensationalism, in a certain type of psychopathic personalities ('seeking recognition' - hysterics), characterized by a desire to play a role, attract attention and make people talk about them, as well as increased activity of fantasy and lying.
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“Trance.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/trance/