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. 2021 Apr 26;12:644874. doi: 10.3389/fneur.2021.644874

Figure 2.

Figure 2

EEG-fMRI F-maps and estimated hemodynamic response functions for all investigated models of the δ4 pattern. The EEG-fMRI F-map colorbar is the same over all models. HRF, hemodynamic response function; IRF, impulse response function. If HRF demonstrated a reduced peak and an amplified trough (i.e., blue color-coded HRFs) the F-values were assigned with a negative sign. The F-maps were threholded with p < 0.0001, i.e., |F| > 8.1. The voxels with |F| > 12.1 met the condition pFWE < 0.05. The red color coded HRFs were derived from voxels with positive signed suprathreshold F-values. All F-maps are shown following the neurological convention, i.e., left hemisphere on the left side of the axial slice. (A) Absolute spectral. (B) Relative spectral. (C) Absolute spatiospectral. (D) Relative spatiospectral.