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Innocent Body-Shadow Mimics Physical Body.

Kenri Kodaka¹, Ayaka Kanazawa¹

¹Nagoya City University, Aichi, Japan.

|May 19, 2017

Summary

The body-shadow can create a sense of ownership, similar to the rubber hand illusion. This illusory ownership is strongest when the shadow is visually and proprioceptively linked to the physical body.

Area of Science:

Cognitive Neuroscience
Body Ownership Illusions
Perception

Background:

The rubber hand illusion (RHI) demonstrates how the brain integrates multisensory information to create a sense of body ownership.
Investigating whether a 'body-shadow' can elicit similar ownership illusions is crucial for understanding self-perception and body schema.
Previous research primarily focused on physical or artificial limbs, leaving the role of shadows in body ownership unexplored.

Purpose of the Study:

To investigate if a body-shadow can induce illusory ownership using the rubber hand illusion paradigm.
To determine the factors influencing illusory ownership and proprioceptive drift related to body shadows.
To explore the cognitive mechanisms underlying the discrimination of self-body shadows.

Main Methods:

Keywords:

body perception body-shadow multisensory or cross-modal processing proprioception

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Adaptation of the rubber hand illusion paradigm using different shadow stimuli (physical hand, hand-shaped cloth, rectangle cloth).
Collection of subjective questionnaire data to assess illusory ownership.
Measurement of proprioceptive drift to quantify changes in body perception.

Main Results:

Both anatomical similarity and visuo-proprioceptive correlation enhanced illusory ownership of the shadow.
Proprioceptive drift was significantly positive only when the body-shadow originated purely from the physical body.
The rubber hand illusion paradigm demonstrated that shadows can distort illusory ownership, but proprioception was only clearly distorted by purely self-generated body shadows.

Conclusions:

Body shadows can influence illusory ownership, extending the principles of the rubber hand illusion.
The origin of the body shadow (purely physical body-related) is critical for distorting proprioception.
These findings suggest specialized cognitive processes for distinguishing self-body shadows from external stimuli, impacting our understanding of self-representation.