Scholars have noted inconsistencies in the list, and regard it to be a later synthesis of several older lists. The first four links may be a mockery of the Vedic-Brahmanic cosmogeny, as described in the Hymn of Creation of Veda X, 129 and the Brihadaranyaka Upanishad. These were integrated with a branched list which describe the conditioning of mental processes, akin to the five skandhas. Eventually, this branched list developed into the standard twelvefold chain as a linear list. While this list may be interpreted as describing the processes which give rise to rebirth, in essence it describes the arising of dukkha as a psychological process, without the involvement of an atman.
