Analysis of mental state of athletes under pressure using electroencepahlograph (EEG) - Gao, P.; Ushiyama, Y.; Hori, J.; Akagawa, R.; Shioiri, A.; Kamijima, K. (Proceedings Book of The 15th ITTF Sports Science Congress Düsseldorf, 27th - 28th May 2017, 2017)