Editing Tactile illusion (section)

==Tactile adaptation illusions==
Many illusions in vision are caused by adaptation, the prolonged exposure to a previous stimulus. In such cases, the perception of a subsequent stimulus is altered. This phenomenon is sometimes referred to as a [[contingent after-effect]]. Similarly, adaptation can cause such illusions in the sense of touch.

*If one hand is immersed in cold water and the other in hot for a minute or so, and then both hands are placed in lukewarm water, the lukewarm water will feel hot to the hand previously immersed in cold water, and cold to the hand previously immersed in hot water.
*If a person is lying on their stomach with arms stretched in front and another person raises their arms about 2 [[Foot (length)|feet]] off the ground and holds them there for approximately one minute, with the person on the ground having their eyes closed and head hanging, then slowly lowers the arms to the ground, it will feel as if the arms are going below the level of the rest of the body.
*Focal adaptation evoked by prolonged stimulation to a skin area causes the illusion that two subsequently presented stimulus points straddling that area are farther apart than they actually are.<ref>{{cite journal|last1=Li|first1=Lux|last2=Chan|first2=Arielle|last3=Iqbal|first3=Shah M.|last4=Goldreich|first4=Daniel|title=An Adaptation-Induced Repulsion Illusion in Tactile Spatial Perception|journal=Frontiers in Human Neuroscience|date=28 June 2017|volume=11|page=331|doi=10.3389/fnhum.2017.00331|pmid=28701936|pmc=5487416|doi-access=free}}</ref> This perceptual repulsion illusion is analogous to various visual repulsion illusions such as [[visual tilt effects]].