A term used to denote a transient *visual hallucination consisting of persons or animals that pass sideways out of the visual field. In a study by the French neurologists Gilles Fénelon et al. among individuals suffering from Parkinson's disease, passage hallucinations tended to last for a few seconds up to 5 min. They are sometimes classified as so-called * minor hallucinations. Etiologically, they are associated with a variety of psychiatric, ophthalmologic, and neurological conditions, including *muscae voli-tantes, narcolepsy, parkinsonism, Parkinson's disease, and the use of* hallucinogens such as mescaline and LSD.
References
Fénelon, G., Mahieux, F., Huon, R., Ziégler, M. (2000). Hallucinations in Parkinson's disease: Prevalence, phenomenology and risk factors. Brain, 123, 733-745.
Dictionary of Hallucinations. J.D. Blom. 2010.