In a recent study from the Journal of Neuron from Switzerland, volunteers  made a hand movement in response to a cue. Some participants were hypnotized with the suggestion their left hands were paralyzed. Others were told to act as though their left hands were paralyzed. Then MRIs were done. 

The MRI's showed that there was a change in communication between the motor areas of the brain and the rest of the brain in those who were hypnotized. 

Researchers believe that hypnosis can result in a disconnection between the command areas of the brain and the part of the brain that would actually do the moving.

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