But someone think that there exist the effect of strengthening the activity of inspiration neur,but there is no definite apneustic center in structure.
So, in addition to considering the external conditions, or the structure of flow activities, we need also to take into account the internal conditions that make flow possible.
While such events may happen spontaneously, it is much more likely that flow will result either from a structured activity or from an individual's ability to make flow occur, or both.