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Updated: Sep 1, 2025
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Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example
Published on: October 24, 2012
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Brain areas associated with visual spatial attention display topographic organization during auditory spatial
Tzvetan Popov1,2, Bart Gips3, Nathan Weisz4
1Methods of Plasticity Research, Department of Psychology, University of Zurich, 1-80502-784644-50205-B15 2TT, Zurich, Switzerland.
Cerebral Cortex (New York, N.Y. : 1991)
|August 16, 2022
Summary
Alpha power modulation in the brain is linked to auditory spatial attention and eye movements. This suggests a top-down mechanism that suppresses irrelevant sounds and guides attention, similar to visual attention processes.
Area of Science:
- Neuroscience
- Cognitive Science
- Auditory Neuroscience
Background:
- Alpha power modulation (8-14 Hz) is a known mechanism in visual attention, suppressing irrelevant sensory input.
- This alpha power modulation has been recently observed in auditory spatial attention tasks.
Purpose of the Study:
- To investigate the link between alpha power modulation and oculomotor action in auditory spatial attention.
- To determine if alpha power modulation reflects a top-down suppression mechanism for auditory distractors.
- To explore the topographic organization of auditory attention in relation to oculomotor control.
Main Methods:
- An auditory spatial attention paradigm using 24 loudspeakers arranged circularly.
- Electrophysiological recordings to measure alpha power.
- Multivariate analyses to predict sound location from neural signals, including saccadic activity.
- A control experiment without visual/auditory input to isolate gaze direction effects.
Main Results:
- A topographically modulated distribution of posterior alpha power was observed, similar to visual attention findings.
- Sound location in the horizontal plane could be predicted from neural signals, even from saccadic activity.
- Alpha power lateralization was linked to gaze direction in the absence of sensory input.
Conclusions:
- Auditory spatial attention involves alpha power modulation closely linked to oculomotor action.
- This suggests a shared top-down attentional control mechanism across sensory modalities.
- Attending to auditory targets engages oculomotor and visual cortical areas topographically, mirroring visual attention organization.
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