Table 1: Statistic of harmonics in SSVEP.

1 𝑓 occurs 2 𝑓 occurs 3 𝑓 occurs Valid trials Total trials

11 Hz sine 20 10 7 22 29
13 Hz sine 22 9 2 22 30
15 Hz sine 23 8 5 25 33
18 Hz sine 23 9 6 25 34
22 Hz sine 19 12 1 20 26
11 Hz triangle 14 10 4 16 22
13 Hz triangle 19 10 0 19 21
15 Hz triangle 16 5 5 16 17
18 Hz triangle 17 6 2 17 21
22 Hz triangle 15 9 3 15 19
11 Hz 50% square 20 11 15 20 21
13 Hz 50% square 17 5 5 17 19
15 Hz 50% square 17 9 8 16 17
18 Hz 50% square 18 9 8 19 19
22 Hz 50% square 18 9 8 18 19
11 Hz 25% square 11 9 5 11 15
13 Hz 25% square 17 8 6 18 18
15 Hz 25% square 7 7 7 10 15
18 Hz 25% square 17 14 10 18 18
22 Hz 25% square 15 15 10 18 18
11 Hz 10% square 8 9 4 12 17
13 Hz 10% square 13 13 6 17 17
15 Hz 10% square 15 12 11 19 20
18 Hz 10% square 16 9 10 20 21
22 Hz 10% square 13 6 6 15 19