Five Shades of Grey: Exploring Quintary m-Sequences for More User-Friendly c-VEP-Based BCIs

Figure 7

Online ITRs for the binary and quintary m-sequences. The values achieved by the 18 participants in the copy-spelling phase are shown per refresh rate. In the box plots, outliers (data points outside 1.5 times the interquartile range) are located outside the “whiskers.”