[proverbialbunny]

Meditation. There are certain kinds of meditation that light up the brain in a near identical way to magic mushrooms, though imho the experience is better. An advanced practitioner only takes about 20 minutes of meditation to get into that kind of state. They can stay in that state as long as they want, and they can strengthen it or weaken it even turning it off whenever they want.

[mkgolden]

Can you share with us some of the mentioned meditations?

[proverbialbunny]

Many different kinds of meditation can end up with that result. In some traditions it starts with the cultivation of samatha and incorporates piti.

Zazen works pretty well for me. ymmv.

[bambataa]

Are you referring to jhana?

[proverbialbunny]

Yes