Haptic Information Improvement on Postural Sway is Information-Dependent But Not Influenced by Cognitive Task

Area of Science:

• Biomechanics
• Human motor control
• Neuroscience

Background:

• Postural control in young adults is crucial for daily activities.
• The role of cognitive load in postural adjustments using sensory feedback systems like light touch (LT) and anchor systems (AS) is not fully understood.
• Previous research indicates sway reduction with LT and AS, but cognitive involvement remains unclear.

Purpose of the Study:

• To investigate the effect of a cognitive task (counting) on postural control in young adults using light touch (LT) and anchor systems (AS).
• To determine if attentional demands influence the effectiveness of LT and AS in reducing body sway.
• To compare the impact of LT and AS on trunk sway and upper limb variability.

Main Methods:

• Nine young adults (mean age 26.7 years) performed an upright tandem stance with eyes closed.
• Participants used either LT or AS (force <2 N) while simultaneously performing a cognitive counting task.
• Measurements included trunk sway amplitude, wrist and shoulder ellipse area, and applied force for LT and AS.

Main Results:

• The cognitive task did not significantly alter trunk sway magnitude or applied force in either LT or AS conditions.
• Trunk sway was significantly reduced with AS and further reduced with LT.
• Variability in wrist and shoulder movements was greater in the AS condition compared to the LT condition.

Conclusions:

• Enhanced sensory input from LT and AS effectively reduces trunk sway in young adults.
• The observed postural improvements occur with minimal or no additional attentional demand.
• LT and AS represent viable strategies for enhancing postural stability without compromising cognitive resources.