If you've ever tried to tickle yourself, you may not have succeeded. This is due to your nervous system suppressing the expected sensation of your own actions, a mechanism known as tactile gating. Until now, this mechanism has been understood as a complex sensory process occurring in response to the activation of tactile receptors.
Within the simulated virtual environment, each participant could see their virtual hands, but could not see their forearms or other parts of their bodies. On a table before each participant were ordinary objects of realistic scale, including two sticks, each about 30 cm long and 2 cm wide.
Left-hand results of phantom touch intensity ratings across different locations on the hand and the forearm. Box colors represent the relevant parts of the hand as depicted on the right; gray dots represent individual data points; horizontal line represents the median; whiskers represent 1.5 times the interquartile range. Compare Supplementary Fig. 1 for the whole range of results across all positions in both hands. Frequencies of verbal descriptions of the PTI sensation.
Information from other senses may also play a part, as the paper suggests:"for example proprioception, or top-down input from the body schema." In addition,
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