Jan 5, 2012

Age-related neural dedifferentiation in the motor system

PloS One
Joshua CarpThad A Polk

Abstract

Recent neuroimaging studies using multi-voxel pattern analysis (MVPA) show that distributed patterns of brain activation elicited by different visual stimuli are less distinctive in older adults than in young adults. However, less is known about the effects of aging on the neural representation of movement. The present study used MVPA to compare the distinctiveness of motor representations in young and older adults. We also investigated the contributions of brain structure to age differences in the distinctiveness of motor representations. We found that neural distinctiveness was reduced in older adults throughout the motor control network. Although aging was also associated with decreased gray matter volume in these regions, age differences in motor distinctiveness remained significant after controlling for gray matter volume. Our results suggest that age-related neural dedifferentiation is not restricted to sensory perception and is instead a more general feature of the aging brain.

  • References35
  • Citations45

Mentioned in this Paper

Motor Performance
Mesial Premotor Cortex
Neurons
Brain
Dedifferentiation
Gray Matter
Senility
Cell Differentiation Process
Area MII of Woolsey
Anaplasia

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