When warm thermal stimulators are placed on the ring and index fingers of one hand, and a neutral-temperature stimulator on the middle finger, all three fingers feel warm. This illusion is known as thermal referral (TR).
See http://www.nature.com/articles/srep35286
Cataldo, Antonio, et al. "Thermal referral: evidence for a thermoceptive uniformity illusion without touch." Scientific reports 6 (2016).
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