Dissociating expectancy-based and experience-based control in task switching
1Department of Experimental Psychology, University of Oxford.
Journal of Experimental Psychology. Human Perception and Performance
|January 28, 2020
Summary
Task switching efficiency is influenced by metacontrol, which is regulated by instructions and motivation. This study shows how expectations impact task switching, not just practice.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Behavioral Science
Background:
- Flexible task switching is crucial for goal-directed behavior.
- Metacontrol may regulate task switching efficiency through contextual factors like switch probability.
Purpose of the Study:
- To investigate the role of metacontrol in task switching.
- To determine if explicit instructions about task switch probability influence switching efficiency.
- To differentiate expectancy-based control from experience-based practice effects.
Main Methods:
- Five experiments were conducted using instruction manipulation to alter participants' beliefs about task switch probability.
- Behavioral data were collected to assess task switching efficiency.
- Electroencephalogram (EEG) was used to examine neural markers of task preparation.
- Objective task frequencies were matched with manipulated instructions in a subset of trials.
Main Results:
- Behavioral results indicated that instructions significantly modulated task switching efficiency, independent of actual experience or practice.
- The influence of instructions on switching efficiency was found to be motivation-dependent.
- EEG data revealed that instructions influenced processing through metacontrol mechanisms, affecting task preparation.
- Instructions also impacted participants' voluntary task choices.
Conclusions:
- Instruction-induced expectancy shapes metacontrol modes, influencing overall task switching performance.
- Metacontrol, driven by expectancy, affects task switching at a strategic level rather than modulating immediate, task-specific motor preparation.
- These findings highlight the significant role of higher-level cognitive control in optimizing task switching behavior.
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