The differential effect of age on upper limb sensory processing, proprioception, and motor function.

Area of Science:

• Neuroscience
• Gerontology
• Human Sensory Systems

Background:

• Sensory processing involves the brain's integration and interpretation of somatosensory information over time.
• The effects of aging on sensory processing, and its relationship with motor function, proprioception, and cognition, are not well understood.
• Proprioception can remain intact even when sensory processing is impaired by factors like lesions.

Purpose of the Study:

• To investigate the impact of aging on upper limb sensory processing abilities.
• To examine the influence of covariates, including motor function, proprioception, and cognition, on sensory processing.
• To compare age-related changes in sensory processing with those in motor function and proprioception.

Main Methods:

• Measured upper limb passive and active sensory processing, motor function, proprioception, and cognition in healthy younger and older adults.
• Analyzed age-related differences across all measured variables.
• Employed regression analysis to evaluate the influence of covariates on sensory processing performance.

Main Results:

• Sensory processing exhibited larger age-related effect sizes (r = 0.38) compared to motor function (r = 0.18-0.22) and proprioception (r = 0.10-0.27).
• Cognition showed the most significant age-related decline (r = 0.56-0.63).
• Active sensory processing was associated with cognition (β = 0.30-0.42), but sensory processing was not significantly related to motor function or proprioception, independent of age.

Conclusions:

• Sensory processing demonstrates a notable age-related decline.
• Certain proprioceptive and motor abilities are preserved in older adults.
• Cognition is a significant factor influencing active sensory processing in aging.