3.5 MRCPs Preceding Cue
To examine whether MRCPs are affected by the preceding cue type, MRCPs were contrasted as a function of the preceding cue type (A, V, or AV) and examined separately for each participant group (ASD, TD) (Figure 6 ). GLMM analyses revealed significant 3-way interactions between group, electrode, and the preceding sensory cue, indicating that MRCP amplitude at peak electrodes (Fz, P3) differs as a function of both sensory cue (AV, A, V) and participant group (TD, ASD) (Late BP: F(2,318,017) = 24.442, p < 0.001; MP: F(2,3818) = 3.978, p = 0.019; RAP: F(2,3818) = 12.553, p < 0.001) (Table 3 ). Visualizations of these interactive effects are provided in S2F-I .
Waveforms from peak electrodes Fz (6E ) and P3 (6F ) are plotted separately for each cue type and indicate largely similar morphology of MRCPs as a function of cue type, with statistical differences evident in TD participants between -150 and -50 ms prior to the button press response, and 50 – 150, primarily over mid-frontal electrodes (including electrode Fz).
While SCPs indicated statistically significant differences between ASD and TD participants across all cue types, these differences were greatest for movements which were cued by multisensory and visual stimuli (6A ). Topographic representations of MRCPs across time bins showing significant group differences based on the SCPs are given in 6B – D .