Adult age differences in task switching.

Kray, Jutta; Lindenberger, Ulman · 2000 · OpenAlex-citations

DOI: 10.1037//0882-7974.15.1.126

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Summary

This study investigates adult age differences in cognitive control, specifically focusing on task-set switching speed. Motivated by the "frontal lobe hypothesis" of aging and the need to functionally define executive components, the authors sought to disentangle the ability to maintain multiple task sets in working memory from the ability to execute the switch itself. The research aimed to determine whether age-related declines in cognitive control are domain-specific or general, how they relate to fluid versus crystallized intelligence, and whether they reflect biological aging losses or lack of practice. The study involved 118 adults aged 20 to 80 years, stratified into six age groups. Participants completed eight sessions of a task-switching paradigm using three distinct stimulus domains: numerical (digit strings), figural (geometric shapes), and verbal (words). The experimental design compared task-homogeneous blocks (performing one task repeatedly) with task-heterogeneous blocks (alternating between two tasks in a predictable sequence). Crucially, no external cues were provided for action selection, maximizing demands on internal control. The authors defined "general switch costs" as the latency difference between heterogeneous and homogeneous blocks, reflecting the maintenance and coordination of two task sets. "Specific switch costs" were defined as the difference between switch and nonswitch trials within heterogeneous blocks, reflecting the execution of the switch. Participants also underwent extensive practice to assess plasticity and were administered a battery of cognitive tests to measure fluid and crystallized abilities. The results indicated that both general and specific switch costs generalized across verbal, figural, and numeric materials, suggesting domain-general cognitive control processes. These costs were more highly correlated with fluid intelligence than with crystallized abilities and remained significant after six sessions of practice, indicating they reflect basic architectural constraints rather than lack of experience. Most significantly, age-associated increments in costs were substantially greater for general switch costs than for specific switch costs. This finding suggests that the ability to efficiently maintain and coordinate two alternating task sets in working memory is more negatively affected by advancing age than the ability to execute the task switch itself. Additionally, older adults showed reduced benefits from increased preparation time (response-stimulus interval) when no external cues were available, further highlighting deficits in endogenous control processes. The significance of these findings lies in the differentiation of cognitive control components in aging. The study supports the view that age-related declines in executive function are primarily driven by deficits in maintaining and coordinating multiple task sets in working memory, rather than in the mechanical execution of switches. By demonstrating that these costs are robust against practice and linked to fluid intelligence, the authors argue that these deficits reflect biological aging losses in the "mechanics" of cognition. This provides a more precise functional definition of executive decline, moving beyond broad frontal lobe associations to specific processes of task-set maintenance and coordination.

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Topics

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• task switching
• executive function