Reduced vision selectively impairs spatial updating in fall-prone older adults

Area of Science:

• Gerontology
• Neuroscience
• Biomechanics

Background:

• Falls are a significant health concern for older adults, with increased risk associated with impaired spatial updating.
• Spatial updating, the ability to track one's position during self-motion, is crucial for maintaining balance and preventing falls.

Purpose of the Study:

• To investigate the role of vision in spatial updating among older adults.
• To determine if deficits in spatial updating under reduced visual conditions contribute to fall risk in older adults.

Main Methods:

• A path integration triangle completion task was administered to fall-prone and healthy older adults under full and reduced vision conditions.
• Spatial updating was assessed by measuring distance and angular errors upon returning to the start point.
• Gait parameters were recorded during the unguided walk back.

Main Results:

• Both fall-prone and healthy older adults performed similarly in the full vision condition.
• In the reduced vision condition, fall-prone older adults exhibited significantly larger distance errors compared to healthy controls.
• No other significant performance differences were observed between the groups.

Conclusions:

• Fall-prone older adults demonstrate a reduced ability to rely on non-visual sensory cues for spatial updating when vision is compromised.
• This difficulty in sensory reweighting under unreliable visual conditions may underlie the increased fall risk in this population.