Effect of aging on coordinated eye and hand movements with two-segment sequence

Area of Science:

• Neuroscience
• Human Movement Science
• Gerontology

Background:

• Coordinated movements involving vision and limb control are crucial for daily activities.
• Aging is associated with declines in motor control and sensory processing.

Purpose of the Study:

• To investigate the age-related effects on multi-segment eye-hand coordination.
• To identify specific components of movement affected by aging.

Main Methods:

• Comparison of young adults and older adults performing two-segment eye-only and eye-hand movements.
• Analysis of saccade initiation, execution, velocity scaling, and gaze fixation stabilization.
• Assessment of hand movement deceleration and intersegment intervals.

Main Results:

• Minimal age differences in initial saccade parameters.
• Older adults showed saccade velocity scaling deficits with concurrent hand movements.
• Slower gaze fixation stabilization and increased hand movement deceleration in older adults.
• Increased intersegment intervals for both eye and hand movements in the elderly.

Conclusions:

• Aging differentially impacts distinct components of coordinated eye-hand movements.
• Specific deficits in saccade control and movement phasing contribute to age-related motor slowing.