Schematic overview of the 200-target brain–computer interface (BCI) system. (IMAGE)

Beijing Institute of Technology Press Co., Ltd

Schematic overview of the 200-target brain–computer interface (BCI) system.

Caption

 (A) Top and rear views of 9/64, 21/64, 32/128, and 66/256 electrode configurations. (B) Basic structure of the BCI system. The 200 targets were formed by combining 40 square luminance-modulated patches (“flickers”) with distinct frequency–phase values and 5 fixation points (right, down, left, up, and center) embedded within each flicker. Each square patch flickered periodically according to its assigned waveform, whereas the fixation markers remained at constant luminance. Stimuli with high visual resolution were presented to the subjects, while high spatial resolution electroencephalogram (EEG) was recorded for feature extraction. The classification results were presented to the subjects in the form of visual feedback, including color changes of selected fixation points and the display of corresponding numeric labels in the text input box.

Credit

Yijun Wang, Laboratory of Solid-State Optoelectronics Information Technology, Institute of Semiconductors, Chinese Academy of Sciences.

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