Fig. 3.

Stimulus-locked and response-locked P3 results suggesting sensitivity to the sequential regularity. a Grand average stimulus-locked ERP waveforms over the centroparietal electrode pool are presented, displaying the P3 component for random and pattern triplets, averaged for all epochs. The light-gray shaded area indicates the time window in which the P3 peak was quantified (280–380 ms); the dark-gray shaded area indicates the time window in which the late P3 was quantified (380–600 ms). Zero ms indicates stimulus onset. b The scalp topography (amplitude distribution) of stimulus-locked ERP differences for pattern minus random triplets in both time windows. c Grand average response-locked ERP waveforms over the centroparietal electrode pool are presented, displaying the P3 component for random and pattern triplets, averaged for all epochs. The light-gray shaded area indicates the time window in which the P3 peak was quantified (−50–50 ms); the dark-gray shaded area indicates the time window in which the late P3 was quantified (50–250 ms). Zero ms indicates response onset. d The scalp topography (amplitude distribution) of response-locked ERP differences for pattern minus random triplets in both time windows