@Cashew - nup, now you're just talking about states of altered consciousness, & their are tonnes of ways/causes for that (including some trauma related):
Trance, hyponosis, sleep-walking, tripping on drugs, a blow to the head, suffocation, dehydration, psychosis, flashbacks, coma, catatonic states, meditation...I can keep going!?
Dissociation is a particular type of altered consciousness, and there are, within 'dissociation', sub-types that describe different ways that form of altered consciousness is experienced.
My understanding is that dissociation, as a particular type of altered consciousness, is involuntarily set off by either a specific stressor or trigger, although sometimes it may be impossible to identify the causative stressor/trigger for a particular episode. While a person can 'encourage' a dissociative state (eg. By putting themself in a situation that they no to be a trigger for their own dissociation), it still remains a fundamentally involuntary state...to be knowledge...