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Caloric vestibular stimulation has no effect on perceived body size
Hans-Otto Karnath1,2, Isabel Kriechel3, Joachim Tesch4
1Centre of Neurology, Division of Neuropsychology, Hertie-Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany. Karnath@uni-tuebingen.de.
Scientific Reports
|August 8, 2019
Summary
The vestibular system, crucial for balance, does not influence the perceived size of body parts. This study found no link between vestibular stimulation and body representation, suggesting separate systems for spatial awareness and body metrics.
Area of Science:
- Neuroscience
- Human Perception
- Vestibular System Research
Background:
- The vestibular system is traditionally linked to balance and posture.
- Emerging theories suggest its involvement in higher-order body representations, like perceived body shape and size.
- Previous virtual reality (VR) studies yielded negative results, possibly due to visual feedback masking vestibular effects.
Purpose of the Study:
- To investigate if vestibular stimulation influences the perceived size of human extremities.
- To test the hypothesis that visual feedback in prior studies obscured the vestibular system's role in body representation.
- To differentiate the vestibular system's contribution to metric body representation versus egocentric spatial awareness.
Main Methods:
- Utilized a virtual reality (VR) scenario with healthy subjects.
- Subjects performed a block adjustment task in 3D space, aiming to simulate touching blocks with their hand or heel.
- Caloric vestibular stimulation was applied while visual feedback of virtual limbs was excluded.
Main Results:
- Caloric vestibular stimulation did not significantly alter the perceived size of subjects' own extremities.
- Excluding visual feedback did not reveal a vestibular influence on the perception of body part size.
- The study contrasted these findings with the vestibular system's known role in egocentric body midline representation.
Conclusions:
- Vestibular signals do not appear to modulate the metric properties of large parts of the internal body representation.
- The perception of body size and the egocentric representation of the body midline likely involve distinct neural systems.
- This research clarifies the specific roles of the vestibular system in human spatial and body awareness.
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