File S1 - Stimulus-Response Mappings Shape Inhibition Processes: A Combined EEG-fMRI Study of Contextual Stopping

Supporting Information on Decomposition of Multi-Subject EEG Data and group-level ICA. The steps involved in the decomposition of multi-subject EEG data are outlined, with additional information provided on the IC-informed fMRI parameterization and the subsequent multimodal IC-informed fMRI analysis. Table S1 contains multimodal results from the IC-informed fMRI analysis. Figure S1. IC-informed fMRI Results. Results from the IC EEG-informed fMRI analyses illustrate that IC3 and, to some extent, IC5 demonstrate regional increases in the left MFG for response inhibition that resemble results presented for the unimodal and time-frequency EEG informed fMRI analysis Figure 4 and 5, respectively). The inhibition control network depicted in IC1 implicates posterior regions. IC1 and IC5 both demonstrate significant regional decreases under stimulus-response mappings requiring infrequent stopping. T-values are reported in Table S1 in File S1, along with voxel data and MNI co-ordinates. Figure S2. Independent Component time and frequency characteristics. Component topographies for IC1 (left) to IC5 (right) are shown along with the corresponding component time-frequency plots, showing bootstrapped power values for all stimuli (first row), go-stimuli (second row), as well as Stim1 (third row) and Stim2 (fourth row) averaged across all three contexts. Figure S3. Low Beta time frequency plot. Low beta power across contexts and stimuli is presented for reasons of consistency, as the low beta plot (see Figure 3) only displays power across EOIs rather than across contexts.
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