First demonstrated over 14 years ago, the rubber hand illusion has proven a valuable tool for investigating how the brain combines information from different senses – including proprioception, the body’s sense of its own position – to create our sense of bodily ownership.
Fifteen volunteers took part in an experiment in which one of their hands was hidden and a rubber hand or piece of wood was positioned on a table before them, oriented in the same direction as the hidden hand, or rotated through 180 degrees relative to it. A researcher then slowly moved their own hand down to 15 centimetres above the rubber hand or wood. Any effects were assessed by recording changes to the volunteers’ skin conductance – a measure of physiological arousal – and using a post-experiment questionnaire.
The volunteers were never touched, yet the results suggest that the illusion was strong when the appropriately oriented rubber hand was in front of them. A second experiment confirmed that the illusion was stronger when the expectation of being touched was present than when it was absent.The study shows that expectation is sufficient to experience a rubber hand as our own, says Costantini. 
What we see as “reality” is what we percieve.
What we percieve is what we think.
We choose what to think.
We can change reality. Literally…
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