Inverse hysteresis effects in a real and virtual environment

Area of Science:

• Biomechanics and Motor Control
• Human-Computer Interaction
• Virtual Reality Applications

Background:

• Repetitive motor tasks often involve reusing previous motor plans to minimize cognitive load, a phenomenon known as motor hysteresis.
• While motor hysteresis is documented in reaching movements, its presence in discrete full-body movements remains largely unexplored.
• Investigating motor hysteresis in full-body tasks could reveal general principles of motor planning and cost reduction.

Purpose of the Study:

• To determine if motor hysteresis manifests in discrete full-body posture selection tasks.
• To compare the efficiency and behavioral patterns of full-body movement studies in real-world versus virtual reality (VR) environments.
• To explore the implications of observed motor hysteresis for motor planning, particularly concerning repetition suppression.

Main Methods:

• Participants performed a full-body posture selection task, navigating through apertures of varying widths, with width sequences designed to induce hysteresis.
• Body rotation was measured to quantify movement adjustments.
• The task was replicated in a virtual reality (VR) environment with a separate group of participants to assess VR feasibility.

Main Results:

• An inverse hysteresis effect was observed: participants initiated body rotation below a critical aperture width, which shifted based on the sequence order.
• This inverse hysteresis pattern was replicated in the VR environment, confirming comparable behavioral dynamics.
• VR participants exhibited more cautious behavior, rotating at wider apertures compared to their real-world counterparts.

Conclusions:

• Motor hysteresis, specifically an inverse effect, is present in discrete full-body movements, suggesting its application to motor planning beyond reaching tasks.
• Virtual reality is a feasible environment for studying full-body movements, though findings may require validation in real-world settings due to behavioral differences.
• The findings suggest that repetition suppression, previously noted in perception, may also play a role in motor planning, especially under high mechanical costs.