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The thermal grill illusion is a sensory illusion originally demonstrated in 1896 by T. Thunberg.[1] The illusion is created by an interlaced grill of warm (e.g., 40°C/104°F) and cool (20°C/68°F) bars. When someone presses a hand against the grill, he or she experiences the illusion of burning heat. But if the person presses against only a cool bar, only coolness is experienced; if the person presses against only a warm bar, only warmth is experienced. To put it more simply, this illusion occurs when certain "wrong" signals override "right" ones and reach the brain first. Researchers have used the illusion to demonstrate that burning pain sensation is in fact a mixture of both cold and heat pain and that it is only the inhibition of the cold pain "channel" that reveals the heat component. Notes ^ Thunberg T (1896). "Förnimmelserne vid till samma ställe lokaliserad, samtidigt pägäende köld-och värmeretning". Uppsala Läkfören Förh (1): 489–95..  References Thunberg T., Förnimmelserne vid till samma ställe lokaliserad, samtidigt pågående köld-och värmeretning. Uppsala Läkfören Förh. 1896; 1: 489–95. Craig AD, Bushnell MC. The thermal grill illusion: unmasking the burn of cold pain. Science. 1994; 265: 252–5. Defrin R, Ohry A, Blumen N, Urca G. Sensory determinants of thermal pain. Brain. 2002; 125: 501–10. [1] This biology article is a stub. You can help Wikipedia by expanding it. v • d • e