Figure 4

Means and standard deviations of mean amplitudes for every 100-ms period of CNV between S1 and S2. (A) Comparison between the first (white circle) and second (gray circle) sets for 15 subjects; (B) Comparison between the first (white circle) and final (black circle) sets for 13 subjects. The asterisk indicates a significant increase on a trial in the final set compared with the first set (*: P <0.05, **: P <0.01). ‘a’ and ‘b’ indicate a significant decrease from the 700–800 ms period after S1 and ‘c’ indicates a significant increase from that, respectively.