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Revised and Neuroimaging-Compatible Versions of the Dual Task Screen
Published on: October 5, 2020
Share or compete? Load-dependent recruitment of prefrontal cortex during dual-task performance
Kathy A Low1, Echo E Leaver, Arthur F Kramer
1University of Illinois at Urbana-Champaign, Beckman Institute, Urbana, Illinois 61801, USA. lowka@illinois.edu
Psychophysiology
|July 4, 2009
Summary
Dual-task performance involves attention competition within the dorsolateral prefrontal cortex (DLPFC). Specific brain regions like the middle frontal gyrus (MFG) show segregated activity during competing tasks, supporting a competition model.
Area of Science:
- Cognitive Neuroscience
- Neuroimaging
Background:
- Dual-task performance necessitates flexible attention allocation.
- The dorsolateral prefrontal cortex (DLPFC) is crucial for executive functions and attention control.
- Models suggest attention control involves selective activation and inhibition within the DLPFC.
Purpose of the Study:
- To investigate if competition during dual-task processing is measurable using event-related optical signals (EROS).
- To examine the role of the DLPFC in attention allocation during dual-task performance.
Main Methods:
- Utilized a dual-task paradigm combining auditory (tone discrimination) and visual (letter memory) tasks.
- Employed event-related optical signals (EROS) neuroimaging for high spatial and temporal resolution.
- Analyzed differential recruitment and competition within left and right DLPFC structures.
Main Results:
- Left middle frontal gyrus (MFG) was preferentially activated by the visual memory task.
- Right MFG exhibited spatially segregated competition between the two tasks.
- Task priority and load differentially affected left and right DLPFC structures.
Conclusions:
- Findings support a competition-based model of dual-task processing.
- Demonstrates the utility of EROS in measuring neural competition within the DLPFC.
- Highlights the distinct roles of left and right MFG in attention allocation during dual-tasking.
