“…As previously mentioned, a number of chemical substances have been discovered that elicit the activation of thermoreceptors, resulting in the perception of cold or warmth (Liljestrand and Magnus, 1922 ; Schreiner, 1936 ; Gollwitzer-Meier, 1937 ; Schmidt, 1949 ; Hensel, 1973 ). However, it can be contended whether these phenomena can truly be classified as illusions, as they do not involve the misinterpretation of external cues.…”