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Updated: Jul 4, 2026

Measurement of Neurophysiological Signals of Ignoring and Attending Processes in Attention Control
Published on: July 5, 2015
Attention modulates earliest responses in the primary auditory and visual cortices
Vahe Poghosyan1, Andreas A Ioannides
1Laboratory for Human Brain Dynamics, AAI Scientific Cultural Services Ltd., Office 501, Galaxias Building Block A, 33 Arch. Makarios III Avenue, 1065 Nicosia, Cyprus.
Spatial attention enhances early sensory processing in the brain. This study found attentional modulation in the primary visual cortex (V1) and auditory cortex (A1) using magnetoencephalography (MEG).
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Sensory Processing
Background:
- Understanding the neural basis of attention is crucial.
- Determining the earliest sensory stage affected by attention remains a key question.
- Previous studies using equivalent current dipole (ECD) analysis yielded conflicting results regarding early sensory processing modulation.
Purpose of the Study:
- To investigate the earliest sensory processing stage modulated by attention.
- To differentiate the effects of spatial versus nonspatial attention.
- To examine attentional effects across visual and auditory modalities.
Main Methods:
- Magnetoencephalography (MEG) signals were recorded from subjects performing attention-demanding detection tasks.
- Distributed source analysis was employed to analyze MEG data.
- Equivalent Current Dipole (ECD) modeling was used to validate findings.
Main Results:
- Spatial attention enhanced the initial feedforward response in the primary visual cortex (V1) between 55-90 ms.
- Attentional modulation was observed in the primary auditory cortex (A1) activity between 30-50 ms.
- Findings were reproduced using ECD modeling, clarifying discrepancies with prior research.
Conclusions:
- Attention can modulate sensory processing at very early stages in both visual and auditory cortices.
- Distributed source analysis provides a more sensitive method for detecting early attentional modulation compared to traditional ECD analysis.
- This research refines our understanding of the temporal dynamics of attention in sensory systems.
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