perceptual synaesthesia
   The term perceptual synaesthesia comes from the Latin noun percipere (to receive, to perceive, to comprehend) and the Greek words sun (together, unified) and aisthanesthai (to notice, to perceive). The concept was introduced in or shortly before 1954 by the Hungarian-Dutch experimental psychologist Géza Révész (1878-1955) to denote what is known simply as *synaesthesia. In other words, the term perceptual synaesthesia is used to denote a hallucinated secondary percept which is triggered by a sense perception experienced in a different sensory modality. A common example is * colour hearing, in which a specific hallucinated colour, such as a patch of yellow, is triggered by a specific auditory percept, such as the sound of a trumpet. Révész called this a perceptual synaes-thesia in order to distinguish it from two additional types of synaesthesia, called * conceptual synaesthesia (in which the secondary 'percept' is not an actual percept, but an ideated sensation without perceptual qualities) and * mental synaes-thesia (in which the secondary percept is triggered by its name).
   References
   Révész, G. (2001). Introduction to the psychology of music. Translated by de Courcy, G.I.C. Mineola, NY: Dover Publications.

Dictionary of Hallucinations. . 2010.

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