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Brain activity associated with selective attention, divided attention and distraction
Emma Salo1, Viljami Salmela1, Juha Salmi2
1Department of Psychology and Logopedics, Faculty of Medicine, University of Helsinki, Helsinki, Finland; Advanced Magnetic Imaging Centre, Aalto Neuroimaging, Aalto University School of Science and Technology, Espoo, Finland.
Brain Research
|April 2, 2017
Summary
This study compared brain activity during auditory and visual attention tasks. Findings reveal distinct fronto-parietal networks for selective attention, with some overlap but also segregation in prefrontal control areas.
Area of Science:
- Neuroscience
- Cognitive Psychology
Background:
- Selective, divided, and distracted attention are crucial cognitive functions.
- Previous research explored these attention types separately, lacking systematic brain activation comparisons.
Purpose of the Study:
- To systematically compare brain activations across selective, divided, and distracted attention to auditory and visual stimuli.
- To investigate the neural underpinnings of top-down attentional control and bottom-up distractor processing.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
- Participants performed auditory (tone pitch) and visual (grating orientation) discrimination tasks, individually or combined, while exposed to auditory or visual distractors.
- Task difficulty was adaptively controlled using a staircase method to maintain high focus.
Main Results:
- Fronto-parietal attention networks were identified for both selective auditory and visual attention, with partial overlap.
- Segregation of prefrontal areas controlling auditory versus visual attention was observed.
- The left middle frontal gyrus showed enhanced activity during divided attention, suggesting a role in dual-task integration.
- Distractors disrupted performance but elicited specific brain activations only in primary auditory and visual cortices, implying early gating.
Conclusions:
- Selective auditory and visual attention involve overlapping yet distinct fronto-parietal networks, with prefrontal segregation.
- Divided attention engages the left middle frontal gyrus for dual-task integration.
- Highly focused attention may gate distractors effectively, limiting their processing to early sensory cortices.