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Does spatial perspective in virtual reality affect imitation accuracy in stroke patients?

Erica M Barhorst-Cates1, Mitchell W Isaacs1, Laurel J Buxbaum1

  • 1Moss Rehabilitation Research Institute, Philadelphia, PA, United States.

Frontiers in Virtual Reality
|April 17, 2023
PubMed
Summary

Virtual reality (VR) imitation tasks show modest accuracy in both stroke patients and controls, with no significant difference between groups. First-person perspective yielded the best imitation, but VR may not effectively detect limb apraxia after left hemisphere stroke.

Keywords:
apraxiaimitationspatial perspectivestrokevirtual reality

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Area of Science:

  • Neuroscience
  • Rehabilitation Medicine
  • Human-Computer Interaction

Background:

  • Imitation is crucial for social interaction, motor learning, and stroke rehabilitation.
  • Left hemisphere stroke (LCVA) often causes limb apraxia, characterized by deficits in novel movement imitation.
  • Virtual reality (VR) offers potential for clinical assessment but is understudied for imitation and apraxia diagnosis.

Purpose of the Study:

  • To assess complex, dynamic arm movement imitation using a novel VR paradigm.
  • To investigate the effect of spatial perspective (first-person, third-person mirror, third-person anatomical) on imitation accuracy.
  • To explore VR's utility in detecting imitation deficits, specifically limb apraxia, in LCVA patients.

Main Methods:

  • Thirty participants (18 LCVA, 12 controls) imitated avatar arm movements in VR across three spatial perspectives.
  • Movement accuracy was qualitatively coded; participants completed embodiment questionnaires and apraxia/background tasks.
  • Background tasks included block-matching, block-mirroring, and mental rotation to assess processing requirements.

Main Results:

  • Imitation accuracy was highest in the first-person perspective; no significant difference between third-person perspectives.
  • LCVA patients and controls showed similar, modest imitation accuracy across all perspectives.
  • Higher imitation accuracy correlated with faster block-matching and better mental rotation, but not with traditional apraxia measures.

Conclusions:

  • VR facilitates experimental control for imitation studies but may not reliably detect limb apraxia in LCVA patients.
  • First-person perspective enhances imitation, suggesting its potential in VR-based motor rehabilitation.
  • Further research is needed to refine VR paradigms for accurate clinical diagnosis of imitation deficits.