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Using Rapid Serial Visual Presentation to Measure Set-Specific Capture, a Consequence of Distraction While Multitasking
Published on: August 29, 2018
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Differential brain mechanisms for processing distracting information in task-relevant and -irrelevant dimensions in
Ping Wei1,2, Hongbo Yu3, Hermann J Müller4
1Beijing Key Laboratory of Learning and Cognition and School of Psychology, Capital Normal University, Beijing, China.
Human Brain Mapping
|September 27, 2018
Summary
Selecting targets among distractors involves distinct brain regions. The fusiform gyrus processes irrelevant color, while frontal eye fields (FEF) and intraparietal sulcus (IPS) handle relevant distractors, especially when targets are absent.
Area of Science:
- Cognitive Neuroscience
- Neuroimaging
Background:
- Goal-directed behavior requires selecting targets from distractors.
- Distractors can share properties with targets, complicating attentional selection.
Purpose of the Study:
- To investigate the neural mechanisms underlying the processing of task-relevant and task-irrelevant information during visual search.
- To determine how stimulus properties, such as feature homogeneity and heterogeneity, influence attentional selection.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used during a visual search task.
- Participants performed feature and conjunction searches with varying distractor properties (orientation, form, color).
Main Results:
- The fusiform gyrus processed task-irrelevant color information.
- Bilateral frontal eye fields (FEF), left intraparietal sulcus (IPS), and left intraparietal-transverse occipital sulcus (IPTO) processed task-relevant distractors, particularly in target-absent trials.
- In conjunction search, task-irrelevant heterogeneity modulated frontoparietal activity only when task-relevant information was homogeneous.
Conclusions:
- Distinct neural mechanisms differentiate the processing of task-relevant and task-irrelevant dimensions.
- Top-down task set critically influences how task-irrelevant information impacts task-relevant processing in frontoparietal regions.
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