Here are a few pictures from the Haptics Class Project Open House on April 30, 2010.
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Thermal Threshold Observed Through the Thermal Grill Effect Relative differences in perception often mar our perceptions of the world, providing our senses with apparent information irrespective of its coherence to reality. A photographer who spends a good amount of time in a dark room will generally experience an intense brightness of light upon emerging. This brightness is generally encountered by human eyes, but having spent so much time in the dark, the light is perceived as much more intense because of the relative brightness. We sought to exploit this phenomenon with regard to the haptic sense. With two copper tubes coiled around a 3/16 inch diameter pipe we ran different temperature waters through each one. The pipes were coiled so that they alternated temperature (temp A, temp B, temp A, and so on). Our endeavor became the reconstruction of a similar perception illusion. The Thermal Grill Illusion is an exploitation of the tendency for thermoreceptors to create a painful perception while nocioceptors remain not stimulated.
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