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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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Orienting auditory attention in time: Lateralized alpha power reflects spatio-temporal filtering
Malte Wöstmann1, Burkhard Maess2, Jonas Obleser1
1Department of Psychology, University of Lübeck, Germany; Center of Brain, Behavior and Metabolism (CBBM), University of Lübeck, Lübeck, Germany.
Neuroimage
|January 1, 2021
Summary
Neural alpha (8-12 Hz) lateralization guides spatial attention over time. This study shows alpha power modulation acts as a spatio-temporal filter, demonstrating top-down control over attention timing.
Area of Science:
- Neuroscience
- Cognitive Science
- Psychology
Background:
- Neural alpha (8-12 Hz) lateralization is known to support spatial attention.
- Its role in temporal attention and as a spatio-temporal filter is less understood.
Purpose of the Study:
- To investigate if alpha lateralization functions as a spatio-temporal filter for attention.
- To examine how temporal foreknowledge influences alpha lateralization.
Main Methods:
- Magnetoencephalography (MEG) recorded brain activity in 20 participants.
- Participants selectively listened to numbers presented spatially, with manipulated temporal cues.
- Behavioral accuracy and alpha power lateralization were analyzed.
Main Results:
- Spatial attention induced alpha power lateralization across all temporal cueing conditions.
- Alpha lateralization modulation was stronger with instructive temporal cues.
- Lateralized alpha power showed stronger modulation at the onsets of temporally cued numbers.
Conclusions:
- Hemispheric alpha power lateralization functions as a spatio-temporal attentional filter.
- This mechanism is sensitive to top-down behavioral goals and temporal expectations.
