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Related Experiment Video

Updated: May 24, 2026

Measurement of Neurophysiological Signals of Ignoring and Attending Processes in Attention Control

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Published on: July 5, 2015

[Alpha ERD and human visual selective attention].

N S Ermachenko, A A Ermachenko, A V Latanov

Fiziologiia Cheloveka

|February 16, 2012

Summary

Alpha band EEG depression, a marker of attention, was higher during visual search and oddball tasks. This brain activity difference highlights distinct attentional processes in complex visual environments.

Area of Science:

Neuroscience
Cognitive Psychology
Electrophysiology

Context:

Investigating the neural correlates of attention is crucial for understanding cognitive processes.
Alpha band electroencephalography (EEG) depression, or event-related desynchronization (ERD), is a known indicator of attentional engagement.
Differentiating between top-down and bottom-up attentional mechanisms requires precise experimental paradigms and analysis.

Purpose:

To compare alpha band EEG depression (ERD) levels during two distinct attentional tasks: visual search and visual oddball.
To investigate the relationship between specific attentional processes (e.g., voluntary control, stimulus-driven capture) and localized brain activity.
To determine if task complexity and stimulus relevance modulate the magnitude and distribution of alpha band ERD.

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Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

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Related Experiment Videos

Last Updated: May 24, 2026

Measurement of Neurophysiological Signals of Ignoring and Attending Processes in Attention Control

Measurement of Neurophysiological Signals of Ignoring and Attending Processes in Attention Control

Published on: July 5, 2015

VisualEyes: A Modular Software System for Oculomotor Experimentation

VisualEyes: A Modular Software System for Oculomotor Experimentation

Published on: March 25, 2011

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

Summary:

Alpha band ERD was significantly greater during visual search compared to a control viewing task, suggesting increased attentional activation.
The visual oddball task also elicited alpha band ERD, with higher levels for relevant stimuli, particularly over occipital areas.
Frontal ERD dominance in visual search may reflect top-down attentional control, while caudal ERD in both tasks suggests bottom-up visual information processing.

Impact:

This study provides electrophysiological evidence differentiating neural activity associated with top-down and bottom-up attention.
Findings contribute to a deeper understanding of how the brain allocates attentional resources in response to varying task demands and visual stimuli.
The results have implications for research on attention, visual processing, and the neural basis of cognitive control.