I talked to the creator of this technique, Dr. Stanislav Grof,
on the podcast about how holotropic breathing can help you reach non-ordinary states of consciousness, and how it can help you resolve trauma from your past. Dr. Grov explains that holotropic breathwork slows oxygen delivery to your brain, which sends distress signals to your limbic system. As a result, this style of breathing changes your self perception and sense of time, inducing a psychedelic state.