Rebirth refers to a process whereby beings go through a succession of lifetimes as one of many possible forms of sentient life, each running from conception to death. The doctrine of anattā (Sanskrit anātman) rejects the concepts of a permanent self or an unchanging, eternal soul, as it is called in Hinduism and Christianity. According to Buddhism there ultimately is no such thing as a self independent from the rest of the universe. Buddhists also refer to themselves as the believers of the anatta doctrine—Nairatmyavadin or Anattavadin. Rebirth in subsequent existences must be understood as the continuation of a dynamic, ever-changing process of pratītyasamutpāda («dependent arising») determined by the laws of cause and effect (karma) rather than that of one being, reincarnating from one existence to the next.