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. 2015 Oct 29;5:15890. doi: 10.1038/srep15890

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Copyright © 2015, Macmillan Publishers Limited

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Two LEDs colored with blue and red were attached with a distance of 1 cm on the center of each glass. The red LEDs placed inside of each glass were paired and each blue LED was separately employed, such that a 3-class BCI system was implemented. The duration of a single flash and inter-stimulus interval (ISI) were set to 100 ms and 1200 ms, respectively.