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.