Fig. 5

Histogram plots related to the minimum number of cross-subject EEG phase alignments required to overcome the accuracy of the subject-specific model across subjects. The number of templates increases as the length of segments decreases. At least 18 templates are required if the length of the segment is longer than 30Â s, while the minimum number of templates increases (a maximum of 24 templates) if the length of the segment is equal to or less than 30Â s.