Attention Modulates Earliest Responses in the Primary Auditory and Visual Cortices

Abstract

A fundamental question about the neural correlates of attention concerns the earliest sensory processing stage that it can affect. We addressed this issue by recording magnetoencephalography (MEG) signals while subjects performed detection tasks, which required employment of spatial or nonspatial attention, in auditory or visual modality. Using distributed source analysis of MEG signals, we found that, contrary to previous studies that used equivalent current dipole (ECD) analysis, spatial attention enhanced the initial feedforward response in the primary visual cortex (V1) at 55-90 ms. We also found attentional modulation of the putative primary auditory cortex (A1) activity at 30-50 ms. Furthermore, we reproduced our findings using ECD modeling guided by the results of distributed source analysis and suggest a reason why earlier studies using ECD analysis failed to identify the modulation of earliest V1 activity.

DOI: 10.1016/j.neuron.2008.04.013

Extracted Key Phrases

0204060200920102011201220132014201520162017
Citations per Year

176 Citations

Semantic Scholar estimates that this publication has 176 citations based on the available data.

See our FAQ for additional information.

Cite this paper

@article{Poghosyan2008AttentionME, title={Attention Modulates Earliest Responses in the Primary Auditory and Visual Cortices}, author={Vahe Poghosyan and Andreas A. Ioannides}, journal={Neuron}, year={2008}, volume={58}, pages={802-813} }