Portable Brain-Computer Interface for the Intensive Care Unit Patient Communication Using Subject-Dependent SSVEP Identification

Table 1

Frequencies conversion values from Hertz to milliseconds versus our systems performance over 4 epochs.

Target frequencies	Hz to ms	1st epoch	2nd epoch	3rd epoch	4th epoch	Average
8.5 Hz	117.647	115.7391	116.913	116.6957	113.2083	115.639
10 Hz	100	98.92308	100.1923	100.1154	100.1538	99.84615
12 Hz	83.3333	82.125	83.5	83.40625	83.40625	83.10938
15 Hz	66.6666	65.71795	66.79487	66.69231	65.95	66.28878