Postural responses to specific types of long-term memory during visually induced roll self-motion

Area of Science:

• Human sensory integration
• Cognitive neuroscience
• Postural control research

Background:

• Visually induced self-motion (vection) and cognitive processing can interfere.
• Postural control is sensitive to visual motion stimuli.
• Memory tasks vary in their reliance on spatial processing.

Purpose of the Study:

• To investigate the interaction between vection, non-vection visual motion, and memory tasks (episodic vs. semantic) on postural control.
• To determine if spatial processing in memory tasks modulates the effect of vection on balance.
• To assess postural sway characteristics under different visual and cognitive conditions.

Main Methods:

• Participants performed quiet stance under conditions of uniform (vection) and non-uniform (non-vection) visual motion.
• Cognitive tasks involved episodic recollection (spatial) and semantic comparison (non-spatial) memory tasks.
• Postural sway was analyzed for deviations, variance, and regularity (entropy).

Main Results:

• Postural responses were compensatory to background motion direction.
• Neither repeated visual motion nor increased cognitive load significantly reduced postural deviations.
• Balance control differed based on memory task, but only during vection and within the motion plane.
• Episodic memory tasks during vection showed increased sway regularity and decreased stability, indicating ineffective postural control.

Conclusions:

• Vection preferentially interferes with spatial cognitive tasks, likely due to shared resource demands with postural control.
• The distinct impact of episodic versus semantic memory on posture during visual motion supports the role of spatial processing in episodic memory.
• Spatial disorientation from visual roll motion affects balance control more significantly when cognitive tasks also require spatial processing.