Average of all trials in 26 subjects after visual stimulation at (a) channel level after ICA-based BCG artefact correction and (b) IC level.

<p>Figures on the left correspond to data recorded at 0T and figures on the righ to data recorded at 9.4T.</p

Characteristics of participants.

<p>Characteristics of participants.</p

Voxel-wise statistical maps with the inclusion of the GABA ratio measured in the PCC and generated by the dual regression analysis of the DMN.

<p>Significant voxels thresholded at p<0.05 (corrected). The point of lowest p value (p = 0.0002) was located in MNI coordinates x = 26, y = 10, z = 4. The background image is the MNI152 T1 (2 mm) template.</p

DMN identified in the group analysis of the 20 subjects; the DMN was picked by visual inspection, comprising medial prefrontal cortex (MPfC), anterior and posterior cingulate cortices (ACC and PCC), precuneus and lateral parietal inferior gyri (LPIG).

<p>DMN identified in the group analysis of the 20 subjects; the DMN was picked by visual inspection, comprising medial prefrontal cortex (MPfC), anterior and posterior cingulate cortices (ACC and PCC), precuneus and lateral parietal inferior gyri (LPIG).</p

Mean z–values extracted from the left putamen in relation to GABA ratio in the PCC.

<p>Mean z–values extracted from the left putamen in relation to GABA ratio in the PCC.</p

MNI coordinates (2 mm template) of clusters with minimal P values of linear relationship between GABA ratio and z–values in the DMN.

<p>MNI coordinates (2 mm template) of clusters with minimal P values of linear relationship between GABA ratio and z–values in the DMN.</p

Depiction of voxel positioning for MRS on a background of a T1 individual structural image.

<p>Depiction of voxel positioning for MRS on a background of a T1 individual structural image.</p

DMN identified from the group analysis of the 15 subjects.

<p>DMN identified from the group analysis of the 15 subjects.</p

Methodological approach: LORETA analysis was performed after correction and demodulation for a specific frequency.

<p>The extracted average power was included into the dual regression analysis in order to identify brain structures whose BOLD signal variation correlates with the power of EEG-frequencies. The image below shows voxels in which alpha power extracted from the ACC was positively correlated (p<0.00833) with the activity of the DMN.</p

Alpha-band source localisation from the averaged signal across the 15 subjects using LORETA.

<p>Alpha-band source localisation from the averaged signal across the 15 subjects using LORETA.</p