Abstract
Virtual Reality (VR) is a technology that has been used to provide the Mirror Visual Feedback (MVF) illusion to patients with promising results. In the present work, the goal is to design, develop and test a portable VR-based MVF system that monitors behavioral information about the performance of a simple motor task. The developed application runs in a stand-alone VR system and allows the researcher to select the real and virtual hands used to perform the motor task. The system was evaluated with a group of twenty healthy volunteers (12 men and 8 women) with ages between 18 and 66 years. Participants had to repetitively perform a motor task in four different experimental conditions: two mirror conditions (performing real movements with the dominant and with the non-dominant hand) and two non-mirror conditions. A significant effect of the experimental condition on embodiment score (p < 0.001), response time (p < 0.001), performance time (p < 0.001), trajectory length (p < 0.004) and trajectory maximum horizontal deviation (p < 0.001) was observed. Furthermore, a significant effect of the experimental moment (initial, middle and final parts of the training) on the performance time was observed (p < 0.001). These results show that the monitored parameters provide relevant information to evaluate the participant’s task performance in different experimental conditions.
Highlights
There are many different types of ownership illusions that can be applied to manipulate the corporal schema
Results from the Friedman test show a significant effect of the experimental condition on the embodiment, χ2 (3) = 23.998, p < 0.001
Results from the Friedman test for the self-location subcomponent of embodiment show a significant effect of the experimental condition, χ2 (3) = 27.411, p < 0.001
Summary
There are many different types of ownership illusions that can be applied to manipulate the corporal schema. One of them is the mirror visual feedback (MVF) illusion. In this technique, participants move one of their limbs while observing a mirror located in their midsagittal plane. The opposite limb is hidden by the mirror, so it cannot be visualized by the participant. The reflections of the limb that is moving are observed in the mirror. This configuration makes participants believe that the movements that are observed in the mirror are from their opposite limb
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More From: International Journal of Environmental Research and Public Health
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