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. Author manuscript; available in PMC: 2019 Jun 1.
Published in final edited form as: J Neural Eng. 2018 Jun 1;15(3):036001. doi: 10.1088/1741-2552/aaa9f6

Figure 2.

Figure 2

Presented stimulus types and experimental procedures for the three experiments. Experiment I, the assessment, collected ECoG responses from visual stimuli (200 ms presentation time) of seven types (Body, Face, Digit, Hira, Kanji, Line and Object). Examples show one out of 20 stimuli for each type in colored (Color) and greyscale (Grey) versions. Each stimulus occurred twice within the experiment (i.e., 40 stimuli per type and color, 560 stimuli in total). Experiment II evaluated the real-time discrimination performance of ECoG responses to presented Face and Kanji computer stimuli (400 ms presentation time), and to idle stimuli (black screen). Subjects viewed 30–40 stimuli of each type (180–240 trials in total) to calibrate the decoder and repeated the experiment with real-time discrimination (without getting any feedback). Experiment III tested the real-time discrimination performance of ECoG responses to natural stimuli (i.e., printed faces and kanji, mirror, real face) presented by the experimenter, one face presented by a co-experimenter and intermediate idle periods where nothing was shown.