Availability of Synchronous Information in an Additional Sensory Modality Does Not Enhance the Full Body Illusion

Participants reported an equally strong illusion for both induction methods in Experiments 1,2 and 3. In the third experiment we additionally measured the time of illusion onset. Like the illusion strength measures, the illusion onset times did not differ between the two induction methods.

In the fourth experiment participants only completed the self-generated movement condition. Again, they reported the FBI, demonstrating that the findings of Experiments 1, 2 and 3 were not dependent on the presence of a condition that used synchronous touch. Together, these findings confirm the hypothesis that the FBI is an all-or-nothing phenomenon and that adding additional multisensory synchronicity does not help to enhance the strength, onset time or onset probability of the illusion.

Date: 01-03-2017 - 30-11-2018 (data collection)