Exploring Virtual Doppelgangers as Movement Models to Enhance Voluntary Imitation

Area of Science:

• Human-Computer Interaction
• Motor Control
• Virtual Reality

Background:

• Virtual Reality (VR) enables studying imitation behavior.
• The chameleon effect describes automatic mimicry.
• Observer and model characteristics influence imitation.

Purpose of the Study:

• To test if affiliative characteristics of virtual models enhance voluntary motor imitation.
• To investigate the role of avatar similarity and likability in imitation.
• To explore VR's potential in modifying motor behaviors.

Main Methods:

• Within-subjects design with four avatar types (abstract to personalized doppelganger).
• Participants imitated virtual character trunk movements (spinal extension, lateral flexion, rotation).
• Range of Motion (ROM) measured via marker trajectories; Autonomous Avatar Questionnaire (AAQ) assessed perceptions.

Main Results:

• Avatar type influenced imitation of lateral flexion (BS).
• This influence was mediated by perceived avatar likability, similarity, and affiliative traits (AAQ1).
• No significant effects were found for spinal extension (BB) or horizontal rotation (RH).

Conclusions:

• Maximizing model-observer similarity in VR, especially with personalized doppelgangers, can enhance motor imitation.
• This finding has implications for observational learning and therapeutic interventions.
• VR interventions could potentially modify maladaptive motor behaviors in patients with chronic back pain.