Aging, visual information, and adaptation to task asymmetry in bimanual force coordination

Area of Science:

• * Neuroscience
• * Human motor control
• * Aging research

Background:

• * Aging affects motor control and coordination, particularly in complex tasks.
• * Visual feedback plays a crucial role in regulating motor performance.
• * Understanding age-related changes in sensorimotor control is vital for maintaining independence.

Purpose of the Study:

• * To investigate age-related differences in redundant finger force coordination strategies.
• * To examine how visual information modulates coordination patterns in older adults.
• * To test hypotheses regarding reduced adaptability versus compensatory strategies in the elderly.

Main Methods:

• * A bimanual asymmetric finger force coordination task was performed by young and elderly adults.
• * Task asymmetry was manipulated using different weighting coefficients for finger forces.
• * Visual information gain was varied to assess its effect on performance.

Main Results:

• * Elderly groups exhibited poorer task performance (higher error, variability) than young adults.
• * Enhanced visual information improved performance across all age groups.
• * Reduced adaptability to task asymmetry was observed in the elderly with low visual gain, but this diminished with high visual gain.

Conclusions:

• * Age-related changes in force coordination are mediated by visual information.
• * Older adults demonstrate reduced adaptability in motor tasks under limited visual feedback.
• * Visual feedback can normalize age-related deficits in sensorimotor control, highlighting the role of multiple constraints.