mind expansion
/ˈmʌɪndɪkˌspanʃn/ /ˈmʌɪndɪɛkˈˌspanʃn/noun
The action of expanding or (apparently) extending the capabilities of the mind. Also: specifically the action of experiencing the effects of (especially psychedelic) drugs.
Origin
1960s; earliest use found in Journal Human Health & Social Behavior. From mind + expansion, after mind-expanding.