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Published on: February 4, 2015
Executive control of cognitive processes in task switching
J S Rubinstein1, D E Meyer, J E Evans
1William J. Hughes Technical Center, Federal Aviation Administration, Atlantic City, New Jersey 08405, USA. Josh.Rubinstein@tc.faa.gov
Summary
Switching between tasks incurs time costs that worsen with complex rules but improve with cues. Executive control models explain task switching by goal-shifting and rule activation, with familiar-to-unfamiliar task shifts being slower.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Human-Computer Interaction
Background:
- Task switching is a fundamental aspect of executive functions.
- Understanding the cognitive mechanisms underlying task switching is crucial for optimizing performance in complex environments.
Purpose of the Study:
- To investigate the factors influencing task switching costs.
- To examine the additive effects of task complexity, familiarity, and cuing on performance.
- To test a model of executive control involving goal-shifting and rule activation.
Main Methods:
- Four experiments were conducted with participants performing alternating or repeated tasks.
- Tasks involved either geometric object classification or arithmetic problem-solving with varying rules.
- Performance was analyzed based on rule complexity, task familiarity, and the presence of visual cues.
Main Results:
- Task alternation resulted in switching-time costs.
- Costs increased with rule complexity and decreased with task cuing.
- The effects of these factors were additive.
- Switching from familiar to unfamiliar tasks was slower than the reverse.
Conclusions:
- Executive control in task switching involves distinct goal-shifting and rule-activation stages.
- Rule activation is influenced by task familiarity, with a greater cost when shifting to unfamiliar tasks.
- Task cuing can mitigate switching costs, suggesting its role in efficient executive control.
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