Effects of spatial working memory capacity and resolution loads on postural stability while dual-tasking

Area of Science:

• Neuroscience
• Human Movement Science
• Cognitive Psychology

Background:

• Spatial working memory involves capacity and resolution loads.
• Cognitive demands, particularly working memory, can affect postural stability.
• Limited research exists on how distinct working memory load types influence balance.

Purpose of the Study:

• To investigate the effects of capacity and resolution loads in spatial working memory on postural stability.
• To examine the interaction between capacity and resolution loads during dual-tasking.

Main Methods:

• A dual-task paradigm combining a tandem Romberg stance (postural task) with a spatial working memory task.
• Capacity load was manipulated (2 vs. 4 bars).
• Resolution load was manipulated (low vs. high resolution change detection).

Main Results:

• Significant interaction found between capacity and resolution loads on sway velocity.
• In low-resolution conditions, higher capacity load reduced dual-task effects on sway velocity compared to low capacity.
• No significant differences in sway velocity were observed in high-resolution conditions across capacity loads.

Conclusions:

• Increased capacity load interferes with postural stability, but only under low-resolution spatial working memory demands.
• The findings highlight a specific interplay between cognitive load types and postural control.
• Dual-tasking reveals complex interactions between working memory components and balance maintenance.