Actually, this is all clearly elucidated in the early Buddhist texts, specifically in Nagarjuna’s exposition of emptiness and dependently arisen phenomena. The Yogacara tenets postulate that cause and result is a phenomenon brought about by the orderly ripening of a seed in the alaya consciousness; it is not an entity that exists outside.

- Quote from The Logic of Emptiness,"Seeing All External Objects as Phenomena of the Mind"