Episodic memory and aging: Benefits of physical activity depend on the executive resources required for the task.

In both groups, updating performance (i.e., 2-Back score) was marginally or significantly positively correlated with the proportion of words recalled in the free-recall task ( r = 0.32, p = .06 for younger adults and r = 0.41, p = .02 for older adults), indicating that the higher the 2-Back score, the greater the proportion of words recalled, whereas these correlations failed to reach significance in the cued-recall task ( r = 0.23, p = .18 for younger adults and r = 0.14, p = .41 for older adults).

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