2011 年 30 巻 1 号 p. 11-18
A tactile stimulus generates different sensations, depending on the delivery source. The rubber hand illusion (RHI), a phenomenon where a touch to one's hand is perceived to come from a fake hand, reflects the role of a multisensory interaction in a coherent body representation. Although this phenomenon has been mostly studied with an experimenter providing tactile stimuli, here we investigate whether a tactile stimulus must be externally produced for RHI to occur. By introducing the condition where a participant touches an artificial hand and his/her own hand simultaneously, the results demonstrate that illusion still occurs, but the perceived amplitude is smaller than that in the ordinal externally produced touch condition. Our results suggest that the externally produced tactile sense is not required for RHI. Further studies are necessary to elucidate the cause of the decreased illusion with the self-produced tactile stimulation.