title: Multisensory origin of the subjective first-person perspective: visual, tactile, and vestibular mechanisms.
abstract: In three experiments we investigated the effects of visuo-tactile and visuo-vestibular conflict about the direction of gravity on three aspects of bodily self-consciousness: self-identification, self-location, and the experienced direction of the first-person perspective. Robotic visuo-tactile stimulation was administered to 78 participants in three experiments. Additionally, we presented participants with a virtual body as seen from an elevated and downward-directed perspective while they were lying supine and were therefore receiving vestibular and postural cues about an upward-directed perspective. Under these conditions, we studied the effects of different degrees of visuo-vestibular conflict, repeated measurements during illusion induction, and the relationship to a classical measure of visuo-vestibular integration. Extending earlier findings on experimentally induced changes in bodily self-consciousness, we show that self-identification does not depend on the experienced direction of the first-person perspective, whereas self-location does. Changes in bodily self-consciousness depend on visual gravitational signals. Individual differences in the experienced direction of first-person perspective correlated with individual differences in visuo-vestibular integration. Our data reveal important contributions of visuo-vestibular gravitational cues to bodily self-consciousness. In particular we show that the experienced direction of the first-person perspective depends on the integration of visual, vestibular, and tactile signals, as well as on individual differences in idiosyncratic visuo-vestibular strategies.
authors: Center for Neuroprosthetics, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.
authors: Christian
authors: C
authors: Pfeiffer
authors: Christophe
authors: C
authors: Lopez
authors: Valentin
authors: V
authors: Schmutz
authors: Julio Angel
authors: JA
authors: Duenas
authors: Roberto
authors: R
authors: Martuzzi
authors: Olaf
authors: O
authors: Blanke
mesh_terms: D000293:Adolescent; D000328:Adult; D003463:Cues; D005260:Female; D006801:Humans; D007088:Illusions / Q000502:physiology; D008297:Male; D009949:Orientation; D010469:Perceptual Distortion; D010775:Photic Stimulation; D014110:Touch; D014722:Vestibule, Labyrinth / Q000502:physiology*; D014796:Visual Perception; D055815:Young Adult
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