Rubber Hand Illusion: Evidence for a multisensory integration of proprioception

Abstract

The present review aims to describe the consolidation of a multisensory integration hypothesis for proprioception through the description of different Rubber Hand Illusion (RHI) experimental settings. RHI is a paradigm created in 1998 to explore the relation between visual and tactile sensory systems. The task involves a synchronous stroking, using a paintbrush, of one of the subjects hand, occluded from his vision, and a prosthetic rubber hand located in front of the subject. Instructed to look at the rubber hand, after approximately half a minute, the subject starts to feel as if the rubber hand is his own hand. The illusion produces a feeling of ownership of the rubber hand. Scientific research has widely investigated the experiment in the last 15 years, indicating the dynamic functions of the brain and body sensory systems, as well as shedding light on amputee rehabilitation and different types of paresthesia The review is structured around three topics: 1) the definition of the RHI, its limits and scope, 2) the physiological and neurocognitive evidence backing the RHI, and 3) the use of RHI in action experimental settings. The paper concludes that RHI is a convenient example of a neuroscientific trend towards an integrated account of body, brain and perceptual space. The illusion has also established an alternative way for studying proprioception and related brain dynamics in normal subjects.