Whole-head covariance analysis (ultra-fast speech perception as a covariate). SPM random-effects group analysis (14 blind, 12 sighted subjects): Effects of ultra-fast speech comprehension capabilities (= covariate) within the SPM T-contrast “ultra-fast speech versus baseline”. Left- and right-hemispheric hemodynamic responses exceeding a threshold of p < 0.0005 (uncorrected) at a voxel level and p < 0.05 (corrected) at a cluster level are color-coded in terms of T values (height threshold). The respective SPM coordinates are listed in Table 2. Abbreviations: aSTS, anterior superior temporal sulcus; FG, fusiform gyrus; IFG, inferior frontal gyrus; PrCG, precentral gyrus; pSTS, posterior superior temporal sulcus; SMA, supplementary motor area; V1, primary visual area.