Context:
Manipulating the unconscious
Related experiments showed that neurostimulation could affect
which hands people move, even though the experience of free will was intact. Ammon and Gandevia found that it was possible to influence which hand people move by stimulating
http://en.wikipedia.org/wiki/Frontal_lobe regions that are involved in movement planning using
http://en.wikipedia.org/wiki/Transcranial_magnetic_stimulation in the left or right hemisphere of the brain.
[28] More: http://en.wikipedia.org/wiki/Neuroscience_of_free_will#Manipulating_the_unconscious