Figure 1. Construction of weighted cortical functional networks.

Using Freesurfer, cortical surface maps were prepared for each subject and parcellated into an atlas of 66 cortical regions. Correlation matrices were generated for each subject and listening condition by computing Pearson's correlations between fMRI activation levels across each pair of regions. Undirected functional networks were obtained by applying absolute thresholds to the correlation matrices to obtain networks over a range of costs, with functional weights assigned based on the (absolute) correlation between connected regions. LH/RH: Left/right hemispheres.