A hallucination was a psychological term referring to visual, auditory, or some other combination of senses giving the brain unreal information, essentially causing a being to perceive something that was not real and that others could not see.

The caves of No'Mat were known to induce hallucinations in Klingons by way of heat and vapors. (TNG: "Birthright, Part I")

The tidal harmonies on Balosnee VI could cause hallucinations. (DS9: "The Nagus")

The psychotropic drug tropolisine caused hallucination. (ENT: "Strange New World")

Denobulans considered hallucinations healthy, particularly for persons under stress, as they saw it as a harmless way to release nervous energy. (ENT: "Exile", "Doctor's Orders")

The Native American vision quest ritual induced a hallucinogenic state. (TNG: "Journey's End"; VOY: "The Fight")

In 2367, when the USS Enterprise-D was trapped in a Tyken's Rift, the crew experienced prolonged REM sleep deprivation and many suffered disturbing hallucinations as a result. (TNG: "Night Terrors")

In 2369, Doctor Julian Bashir believed he was hallucinating when he saw the affectionate Jadzia Dax on his bed. (DS9: "If Wishes Were Horses")

The Botha of the Delta Quadrant attacked others by inducing hallucinations through a psionic field, eventually trapping each individual's mind in a fantasy world. (VOY: "Persistence of Vision")

The telepathic pitcher plant, a large bioplasmic organism, lured starships into its maw by creating a neurogenic field that showed their crews hallucinations of their desires. (VOY: "Bliss")

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