Satpal Singh talks about enlightement in the Sikh tradition: The book Matthieu Ricard and Wolf Singer , Brain Research and Meditation, here the German edition: https://www.suhrkamp.de/buch/hirnforschung-und-meditation-t-9783518260043 Daniel Goleman described this state with increased gamma wave in the left pre-frontal cortex as following: «in the classical meditation litterature it is called enlightened, liberated, awake, we do …