neurological and physiological symptom gustatory illusion true Also known as taste illusion. The term gustatory illusion is indebted to the Latin noun gustus, which means taste. It is used to denote an aberrant taste sensation occurring in the presence of a tastant. The group of gustatory illusions comprises dysgeusia, hypergeusia, and parageusia. The gustatory illusion is commonly classified as a chemosensory disorder. https://www.ncbi.nlm.nih.gov/pubmed/19423297