The idea of development is also featured in the spiritual psychotherapy and psychology of Stuart Sovatsky. His understanding of human development, which is largely informed by east/west psychology and the tradition and hermeneutics of Yoga, places the human being in the midst of spiritual energies and processes outlined in yogic philosophy. According to Sovatsky these are maturational processes, affecting body and soul. Sovatsky adapts the concept of Kundalini as the maturational force of human development. According to his model a number of advanced yogic processes are said to assist in "maturation of the ensouled body".