Figure 1. Workflow of a P300 speller (top path) and an SSVEP speller (bottom path). (IMAGE)

Science China Press

Figure 1. Workflow of a P300 speller (top path) and an SSVEP speller (bottom path).

Caption

For each speller, the user watches the stimulation interface, focusing on the character he/she wants to input, and EEG signals are recorded and analyzed by the speller. The P300 speller first identifies the row and the column that elicit the largest P300, and then outputs the character at their intersection. The SSVEP speller identifies the output character directly by matching the user's EEG oscillation frequency with the flickering frequency of each candidate character. Here is a demo of an SSVEP based BCI speller, developed by a co-author of this paper (Tzyy-Ping Jung) and his collaborators: https://www.youtube.com/watch?v=KCW57QDNDos

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@Science China Press

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