A hallucination was the perception of something that was not present.
History and specifics
Hallucinations were a side effect of the Klingons' thought-shield, especially to James T. Kirk and Montgomery Scott when they visited Organia (which was confined in one) in 2269. (TOS novel: Spock Must Die!)
In 2326, Cadet Jean-Luc Picard at first thought his sightings of Delcara were hallucinations. (TNG novel: Vendetta)
In 2369, DTI agents Marion Dulmur and Gariff Lucsly asked Montgomery Scott about a time traveling Captain Pavel Chekov apparently appearing aboard the USS Enterprise during its voyage to the Babel Conference in 2268. Scott suggested that he might have hallucinated the whole thing, a result of leaking gas fumes in engineering. Afterward, however, he checked that a mysterious device left by Chekov was still safely aboard the
shuttlecraft. (STO - The Short Story Collection short story: "Time of the Scotsman")
Also in 2369, Doctor Beverly Crusher discovered that Pelavians exhaled chemicals which caused hallucinations in Humans when inhaled. (TNG - The Amazing Stories short story: "On the Scent of Trouble")
Appendices
External links
- Hallucination article at Memory Alpha, the wiki for canon Star Trek.
- Hallucination article at Wikipedia, the free encyclopedia.