ipant administer stimulation to a prosthetic hand while the Examiner, with an identical
stimulus (index finger, paintbrush or stick), administers stimulation to the participant’s
hand. With synchronous stimulation, participants experience the compelling illusion that
they are touching their own hand. In the current study, the robustness of this illusion was
assessed using incongruent stimuli. The participant used the index finger of the right hand
to administer stimulation to a prosthetic hand while the Examiner used a paintbrush to
administer stimulation to the participant’s left hand. The results indicate that this violation
of tactile expectations does not diminish the illusion of self-touch. Participants experienced
the illusion despite the use of incongruent stimuli, both when vision was precluded and
when visual feedback provided clear evidence of the tactile mismatch.