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.
journal_name
Neuronjournal_title
Neuronauthors
Poghosyan V,Ioannides AAdoi
10.1016/j.neuron.2008.04.013subject
Has Abstractpub_date
2008-06-12 00:00:00pages
802-13issue
5eissn
0896-6273issn
1097-4199pii
S0896-6273(08)00339-5journal_volume
58pub_type
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