Ayaka Kanazawa (graduate student), an associate professor at the Graduate School of Design, Nagoya City University, said on May 5, the position of the hand by looking at the "shadow of the hand" projected directly above the hand. Announced that it was confirmed by experiments that the sensation was raised upward, which is the position of the "shadow of the hand".

 Research on the "illusion of the body" is progressing worldwide.The most well-known type of illusion is the "rubber hand illusion", which synchronizes the various sensations given to both the "physical hand" and the similar "fake hand" image. It is known that this induces the sensation of actually owning a "fake hand" ("physical possession").These results have been utilized in VR technology, and their effectiveness has been confirmed in rehabilitation using a mirror to normalize the sensation of incomplete limbs.

 Normally, in order to cause the "illusion of the body", the intervention of tactile movements by the experimenter or the movement movements by the experiencer himself (and the synchronization of the movements of the "fake hand") are required.The only display that induces the illusion is the "mirror", but due to the characteristics of the mirror image, the transition of the "positional sensation" that can be induced by the illusion is limited to the horizontal direction.

 This time, Associate Professor Kotaka's research team focused on the shadow phenomenon and created a simple device that projects the "shadow of the hand" directly above the hand. ), When looking at the "shadow in the shape of a hand", it was found that the subjective "feeling of physical possession" for the shadow was improved.This is the first time in the world that shadows have the property of actually modulating the "positional sensation" of their owner, the body.In addition, the experimental equipment this time is a very simple one that does not use a computer at all, and it is also useful as a method for children to experience the "illusion of the body" closely.

Paper information:[I-Perception] Innocent Body-Shadow Mimics Physical Body

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