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Related Concept Videos

Somatosensation01:33

Somatosensation

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The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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Related Experiment Video

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Spatial tactile localization depends on sensorimotor binding: preliminary evidence from virtual reality.

Matteo Girondini1,2,3, Massimo Montanaro2, Alberto Gallace1,2

  • 1Department of Psychology, University of Milano-Bicocca, Milan, Italy.

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|March 6, 2024
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Summary

Virtual reality can alter body perception by creating mismatches in sensory-motor feedback. This study shows that altered haptic feedback in VR can induce spatial biases in how we process bodily information.

Keywords:
point of subjective equality (PSE)sensorimotor bindingtactile localizationtemporal order judgment (TOJ)virtual reality

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Area of Science:

  • Neuroscience
  • Human-Computer Interaction
  • Psychophysics

Background:

  • The brain uses anatomical and spatial frames of reference to map the body.
  • Mismatches between these frames, like the "crossing hand" effect, disrupt bodily information processing.
  • It's unclear if such disruptions occur with artificially created sensory-motor conflicts.

Purpose of the Study:

  • To investigate if artificial sensory-motor conflicts in virtual reality (VR) can induce spatial biases in body perception.
  • To determine if manipulating haptic feedback during a VR task affects the processing of somatosensory stimuli.

Main Methods:

  • 16 participants completed a temporal order judgment task before and after a VR task.
  • The VR task involved controlling a virtual cube, with congruent or incongruent haptic feedback.
  • Psychophysical measures, including the point of subjective equality (PSE) and just-noticeable difference (JND), were calculated.

Main Results:

  • The point of subjective equality (PSE) shifted towards the hand receiving haptic feedback after the VR task.
  • This shift occurred in both congruent (feedback on the controlling hand) and incongruent (feedback on the contralateral hand) conditions.
  • The results indicate a modulation of spatial biases in bodily information processing.

Conclusions:

  • Virtual environments can induce spatial biases in body perception by altering sensory-motor interactions.
  • Haptic feedback manipulation in VR is a viable method to study and potentially influence body representation.
  • This research highlights the plasticity of the brain's body mapping in response to controlled sensory-motor experiences.