Abstract
Simple or unformed hallucinations may be difficult to differentiate from the complex or formed type. When optic illusions are present, the distinction is more difficult. For example, what appears to be a black speck in one field of vision may seem to move after a short period of time. The illusion of movement may then be accompanied by an apparent change in the shape and size (metamorphopsia) or in color (metachromatopsia) of the object which ultimately appears to be an “nsect” or some other animal in motion. When this illusory image becomes multiplied there is polyopia. The visualization of many “insects” crawling is now classified as an hallucination or “zoopsia”. Is the latter visual sensation a series of illusions or is it an hallucination?
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Feldman, M., Bender, M.B. (1970). Visual Illusions and Hallucinations in Parieto-Occipital Lesions of the Brain. In: Keup, W. (eds) Origin and Mechanisms of Hallucinations. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-8645-6_3
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DOI: https://doi.org/10.1007/978-1-4615-8645-6_3
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