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. 2019 Oct 10;10(10):681. doi: 10.3390/mi10100681

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Raw SSVEP and their spectrum obtained by proposed BCI system when focusing on flashing icon with specific frequencies of (a) 9 Hz, (b) 10 Hz, and (c) 11 Hz.