The Interaction Between Long-Term Memory and Postural Control: Different Effects of Episodic and Semantic Tasks

Area of Science:

• Neuroscience
• Human Movement Science
• Cognitive Psychology

Background:

• Postural control is crucial for maintaining stability.
• Cognitive load, particularly from memory tasks, can influence motor performance.
• Understanding the interplay between memory systems and postural control is important for cognitive and motor neuroscience.

Purpose of the Study:

• To investigate the effects of different long-term memory types (episodic vs. semantic) on postural control in young adults.
• To compare postural responses during dual-tasking involving memory recall and upright stance.

Main Methods:

• Young adults performed unperturbed upright stance tasks.
• Participants engaged in dual-tasking, involving recalling episodic or semantic memories concurrently with maintaining balance.
• Postural sway was analyzed using measures like mean distance, velocity, power spectral density, and sample entropy.

Main Results:

• Dual-tasking significantly altered postural control compared to a simple postural task, increasing sway velocity and high-frequency power, and reducing regularity.
• Mean sway velocity was consistently higher during semantic memory recall than during episodic memory recall.
• Despite these differences, overall steadiness (mean distance) was comparable between memory conditions.

Conclusions:

• Cognitive processes engaged during memory recall impact postural control strategies.
• Findings suggest potential spatial resource sharing between postural control and episodic memory retrieval.
• The type of memory engaged (episodic vs. semantic) differentially affects the neural resources allocated to postural stability.