Five Shades of Grey: Exploring Quintary m-Sequences for More User-Friendly c-VEP-Based BCIs
Table 1
Summary of the mean (SD) or median values from the offline analysis, online performance, and questionnaire per flickering pattern across 18 participants.
60 Hz
120 Hz
240 Hz
Binary
Quintary
Binary
Quintary
Binary
Quintary
Offline accuracy (%)
97.7 (2.8)
98.7 (3.1)
99.0 (2.3)
96.9 (9.8)
94.7 (9.6)
96.3 (12.4)
Online accuracy (%)
99.4 (1.8)
98.5 (2.5)
97.6 (6.0)
97.5 (5.0)
97.9 (3.6)
97.6 (4.8)
Experiment time (s)
45.2 (7.0)
45.3 (4.4)
46.4 (9.8)
50.7 (12.0)
50.1 (12.5)
59.7 (37.8)
ITR (bits/min)
64.8 (8.8)
63.9 (6.1)
63.7 (11.5)
59.2 (11.4)
59.5 (12.5)
55.9 (14.8)
Relaxing/exhausting
4
2.5
3.5
3
3
3
Comfortable/annoying
4
3
3.5
2.5
3.5
3
The provided values for the offline accuracies were achieved with a classification time window of 1 s.
