FIGURE 4 | Significant interaction and marginally significant main effect for P3a response. The cut-off points for mother’s education in figures are for illustration purposes only. (A) Individual P3a amplitudes for consonant deviants for all four measurements. Red line represents change in amplitudes for an individual with high (6/7) and black line for low (2/7) maternal education. (B) P3a amplitudes for consonant deviant averaged over all measurements for children with high (6/7) or low (2/7) maternal education (High: mean amplitude –3.10 µ V, SEM = ± 0.28, Low: mean amplitude –4.06 µ V, SEM ± 0.40).