Figure 4. The learning effect.

Grand averages of event-related potentials of 4-month-old infants (n = 34) for the processing of the verb left: grand averages for first test phase (TP1), right: grand averages for last test phase (TP4). The processing of the incorrect condition (red line) is plotted against the processing of the correct condition (blue line). The solid vertical line indicates the onset of the verb, the broken line at the scale plot indicates the onset of the suffix. Negative is plotted upwards.