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 .