The HAROLD model indicates that older brains recruit additional neural units to increase attentional resources, processing speed, or

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The HAROLD (Hemispheric Asymmetry Reduction in Older Adults) model suggests that as people age, there is a reduction in the typical asymmetry of brain function observed in younger individuals. This model indicates that older adults might recruit additional neural resources, particularly from the contralateral hemisphere, to compensate for age-related declines in cognitive function. The CRUNCH model (Compensation-Related Utilization of Neural Circuits Hypothesis) also describes how older adults may recruit additional brain regions to compensate for age-related declines, but it is the HAROLD model that specifically addresses the increase in bilateral brain activity as a compensatory mechanism.

The HAROLD Model Indicates That Older Brains Recruit Additional Neural