2.9.3 MRCP Components
To investigate MRCP component
modulation by group in the timeframe of the late BP (-350 to 0 ms), MP
(0 to 25 ms) and RAP (90 – 130 ms), average amplitudes within each
timewindow were extracted from electrodes Fz and P3, which showed peak
motor activity at response onset based on a topographic map of all 168
participants (Figure 3A ). Three identical GLMM models were
conducted, one per component. Table 3 details all model
factors. Briefly, main effect terms were included for each of five
factors of interest: participant group (TD, ASD), electrode site
(electrodes Fz and P3), preceding sensory cue condition (AV, A, V), and
reaction time bin (fastest 25%, middle 25-50%, middle 50-75%, slowest
25%). To further investigate the effect of participant group (TD, ASD)
on MRCP amplitude, two-way and three-way interaction terms involving
‘Group’ were included. All models included ‘Participant’ as a random
factor.