Submission 714
Adapting to the Flexibility-Stability Trade-off Through Experience, Not Instructions
SymposiumTalk-04
Presented by: Daxun Zhu
Cognitive flexibility is essential in daily multitasking, but is constrained by a trade-off with cognitive stability. Although dual-task performance can follow serial or parallel strategies, it is unclear whether people can voluntarily regulate these strategies through explicit instructions. In four between-subject experiments (N = 650), we asked participants to adopt a parallel (flexible) or serial (stable) strategy. However, instructions had no effects on task-switch costs or task-rule congruency effects, suggesting people were unable to alter strategy use. In contrast, manipulating proportion congruency had a direct effect on conflict processing alone, indicating that targeted strategic adaptations are possible. Notably, we observed a flexibility-stability trade-off in the first block, reflected in a negative correlation between switch costs and congruency effects, which, interestingly, gradually dissipates by the fourth block. This reversal replicated across four additional, independent datasets (total N = 1764). Together, these results suggest that while the flexibility-stability trade-off may be inherent, people can adapt to it through learning and practice, but not through explicit instructions.