BTW, you can achieve this permanently with deep spiritual work and most importantly, meditation. Shinzen Young talks about the different experiments they are n

BTW, you can achieve this permanently with deep spiritual work and most importantly, meditation. Shinzen Young talks about the different experiments they are now starting to perform with deep practitioners of Zen Buddhism (but other schools can likely achieve the same effect). In one of them they are measuring a certain specific response in the brain, which for a normal person happens when they hear a new unexpected stimuli, like a sudden loud bird chirp outside. For a normal person, if this same stimuli is repeated, the "novelty" response in the brain dampens after 2-3 repetitions, and each subsequent chirp is not registering in their brain in the same way. For them it becomes something old. But when they measure a meditating practitioner in the same way - they exhibit the novelty response unlimited number of times, each time a chirp is played. It is like each time it happens - for them it's like a completely new experience.