Age-Related Differences in the One Target Advantage: Exploring the Impact of Augmented Sensory Feedback

Area of Science:

• Neuroscience
• Motor Control
• Human Aging

Background:

• The one-target advantage (OTA) describes faster single-target movements than those in a sequence.
• OTA is established in young adults, but less understood in older adults with motor changes.
• Augmented sensory feedback's role in OTA for older adults is unclear.

Purpose of the Study:

• To investigate if augmented sensory feedback influences goal-directed aiming within the OTA paradigm.
• To compare the effects of vibrotactile (VT) and auditory (A) feedback versus no feedback (NF) on motor performance in younger and older adults.

Main Methods:

• Thirty participants (15 younger, 15 older adults) performed one- and two-target aiming tasks.
• Tasks were conducted under three conditions: vibrotactile feedback, auditory feedback, and no feedback.
• Movement time, reaction time, and spatial accuracy were measured.

Main Results:

• Reaction time was shorter in two-target tasks than one-target tasks with VT feedback (p=.002).
• Older adults showed reduced movement times and improved spatial accuracy (less undershooting) with VT feedback compared to NF (p=.011).
• VT feedback also reduced the post-peak velocity phase duration in older adults.

Conclusions:

• Vibrotactile feedback significantly enhances both temporal and spatial aspects of motor performance, particularly in older adults.
• VT feedback shows potential for mitigating age-related declines in motor control.
• Auditory feedback had minimal effects, suggesting VT is more promising for this application.