Spatial Attention and the Effects of Frontoparietal Alpha Band Stimulation.
A frontoparietal network has long been implicated in top-down control of attention. Recent studies have suggested that this network might communicate through coherence in the alpha band. Here we aimed to test the effect of coherent alpha (8-12 Hz) stimulation on the frontoparietal network. To this end, we recorded behavioral performance and electroencephalography (EEG) data while participants were engaged in a spatial attention task. Furthermore, participants received transcranial alternating current stimulation (tACS) over the right frontal and parietal cortex, which oscillated coherently in-phase within the alpha band. Compared to a group of participants that received sham stimulation, we found that coherent frontoparietal alpha band stimulation altered a behavioral spatial attention bias. Neurally, the groups showed hemispheric-specific differences in alpha coherence between the frontal and parietal-occipital cortex. These results provide preliminary evidence that alpha coherence in the frontoparietal network might play a role in top-down control of spatial attention.
Departments of Neurology, Physiology and Psychiatry, University of California, San FranciscoSan Francisco, CA, USA; Neuroscape, University of California, San FranciscoSan Francisco, CA, USA; Department of Psychology, University of AmsterdamAmsterdam, Netherlands.
Martine R
MR
van Schouwenburg
Departments of Neurology, Physiology and Psychiatry, University of California, San FranciscoSan Francisco, CA, USA; Neuroscape, University of California, San FranciscoSan Francisco, CA, USA.
Theodore P
TP
Zanto
Departments of Neurology, Physiology and Psychiatry, University of California, San FranciscoSan Francisco, CA, USA; Neuroscape, University of California, San FranciscoSan Francisco, CA, USA.
Adam
A
Gazzaley
alpha oscillations; coherence; connectivity; transcranial alternating current stimulation; visual attention