Fig. 2

LAB Study: Experimental Setup and Interface. (a) The LAB study experiment primarily involves participants watching videos on a monitor, some of which contain positive or negative emotions toward a character, while their EEG signals are recorded using an EEG cap. Participants adjust to a comfortable sitting position in advance and strive to minimize vigorous physical movements to reduce interference with the EEG signals. The EEG cap is a non-invasive device that does not interfere with the participants’ normal video-viewing experience. (b) A screenshot of the experimental platform’s webpage shows the video playback window in the center with a “like” button below. After the video has played more than halfway, participants can click the “nextone” button at any time to proceed to the next video. Each participant has an independent account.