 Some, but by no means all, attachment therapists have used rebirthing techniques to aid regression.The roots of the form of rebirthing used within attachment therapy lie in primal therapy (sometimes known as primal scream therapy), another therapy based on beliefs in very early trauma and the transformational nature of age regression.Bowlby explicitly rejected the notion of regression stating "present knowledge of infant and child development requires that a theory of developmental pathways should replace theories that invoke specific phases of development in which it is held a person may become fixated and/or to which he may regress."