Fig. 1
From: Directly wireless communication of human minds via non-invasive brain-computer-metasurface platform
The EBCM platform. a The system architecture of EBCM. The operator equipped with electrodes and P300 BCI device can directly instruct the metasurface with diverse EM functions under visual stimulus with the specific temporary coding sequences. Four typical schemes including brain-wireless communications, coding pattern encoding, beam scanning, and multi-function of EM modulations are demonstrated. b The graphical user interface of the beam deflection scheme. The buttons with different circles represent different beam scattering directions, where the highlight stimulus is green blocks. c Schematic diagram of the stimulus sequence, in which 40 rows represent the 40 buttons, and the yellow blocks mark the highlights of the buttons, each of which lasts for 100 ms. d The experimentally measured EEG signals of five button operations, where obvious amplitude peaks occur at about 300 ms