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Updated: May 5, 2026
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Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
Published on: January 23, 2017
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Higher baseline alpha power is associated with faster responses in visual search
Katharina Duecker1,2, Kimron L Shapiro2, Simon Hanslmayr3
1Department of Neuroscience, Brown University, RI, USA.
Biorxiv : the Preprint Server for Biology
|September 5, 2025
Summary
High alpha brainwave power before visual search predicts faster performance. This suggests alpha oscillations enhance, rather than inhibit, visual processing through top-down control.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Visual Perception
Background:
- Visual search models prioritize task-relevant items.
- Distractor inhibition improves search efficiency, but neuronal mechanisms are debated.
- Alpha oscillations (7-14 Hz) are linked to cortical inhibition and distractor suppression.
Purpose of the Study:
- Investigate the role of alpha oscillations in visual search.
- Determine if alpha oscillations support distractor deselection.
- Explore the relationship between pre-search alpha power and search performance.
Main Methods:
- Magnetoencephalography (MEG) recorded brain activity.
- General Linear Model (GLM) controlled for confounds.
- Rapid Invisible Frequency Tagging (RIFT) measured cortical excitability.
Main Results:
- Higher pre-search alpha power correlated with faster visual search.
- GLM analysis ruled out practice or fatigue effects.
- Pre-search alpha power did not correlate with RIFT responses, challenging feature-specific inhibition.
Conclusions:
- Increased occipital alpha power enhances visual search performance.
- Findings challenge the view of alpha oscillations solely as inhibitors.
- Alpha power may reflect enhanced top-down control in visual search.
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