Figure 2

Event related potentials. (a–e) Plot of mean cortical responses at channel FCz. The mean across subjects and conditions is shown in bold black and the standard deviation is shown in gray. The number of trials included in the average for each subject is noted in the lower left corner. The N1 latencies of individual subjects are shown with the horizontal box plot in the upper left. Topographic plots of cortical responses show the average voltage spread across all subjects at different electrode locations in the axial plane, with the nose at the top. Negative voltage is colored blue, positive voltage is colored red. The latency corresponds to the latency of the N1 peak in the averaged curve. (a) Onset response (pause–S1); (b) Offset response (S3–pause); (c) Acoustic change complex (ACC) for amplitude modulation detection (AMD, S1–S2); (d,e) ACC for amplitude modulation frequency discrimination (AMFD, S2–S3) for 3-stimulus paradigm (d) and for 2-stimulus paradigm (e); (f,g) Comparison between AMFD 2- and 3-stimulus paradigms regarding the absolute N1 peak amplitudes (f) and the signal-to-noise ratio (SNR) (g). Stars indicate significance differences between the 2- and the 3-stimulus paradigm (*p < 0.05).