Cognitive flexibility in aging: the impact of age range and task difficulty on local switch costs in task switching.
Level 4 - case-series / case-control
Cross-sectional comparative study across age cohorts without longitudinal follow-up.
PubMed 40933826 · doi:10.3389/fnagi.2025.1619441
What was done
The authors evaluated how age and task complexity affect local cognitive switch costs, defined as reaction time and error differences between task-switch and task-repetition trials. They compared performance across two difficulty levels (easy: two task rules; difficult: four task rules) across four age cohorts: young adults (19–33 years) and three older adult cohorts (64–72, 73–80, and 82–97 years).
What was found
The abstract reports no numerical values, reaction times, error rates, or exact p-values. It reports that all three older adult groups showed significantly higher switch costs compared to younger adults, an effect that was more pronounced in the difficult task switching condition than the easy one, even after accounting for age-related slowdown. No clear differences in local switch costs were found among the three older adult groups.
Why it matters
The findings demonstrate that age-related deficits in cognitive flexibility become prominent when task switching difficulty is sufficiently high, helping resolve prior conflicting literature on local switch costs.
Limits
The abstract does not state sample sizes (n is unknown) or report quantitative statistics and effect sizes. The cross-sectional design cannot measure longitudinal trajectories within individuals and may be vulnerable to cohort effects.