Breathwork
Neurobiological substrates of altered states of consciousness induced by high ventilation breathwork accompanied by music - https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0329411
Neurobiological substrates of altered states of consciousness induced by high ventilation breathwork accompanied by music - https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0329411