Special symposium: The upcoming 90th anniversary in 2019 of Berger's discovery of EEG-4. New developments in quantitative EEG analysis. Issue 10 (October 2019) - Yoshimura, Masafumi; Nishida, Keiichiro; Kitaura, Yuichi; Ikeda, Shunichiro; Pascual-Marqui, Roberto D.; Kinoshita, Toshihiko