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This study explored internal executive control processes during dual-tasking. Predictable task orders improve performance by allowing endogenous control, but this control doesn't rely on working memory.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience

Background:

  • Dual-task performance often results in impairments, known as dual-task costs.
  • These costs are attributed to bottleneck limitations and executive control processes that regulate task access.

Purpose of the Study:

  • To investigate internally triggered (endogenous) executive control processes.
  • To characterize how endogenous control regulates bottleneck access in dual-tasking.

Main Methods:

  • Participants performed dual-task blocks with predictable task orders (repetitions and switches).
  • Preparation time and task-order information were manipulated.

Main Results:

  • Predictable task orders and increased preparation time enhanced endogenous control efficiency and switch preparation (Experiment 1).
  • Endogenous control was not found to be related to working memory maintenance (Experiment 2).
  • Endogenous control preparation also requires exogenous, stimulus-driven components (Experiment 3).

Conclusions:

  • Evidence supports the existence of endogenous control processes for regulating dual-tasking.
  • Endogenous control is distinct from working memory maintenance and integrates external cues.