Thus, supporting a theory that language acquisition is a maturational process. It emphasises the interactions and interdependencies between maturational and environmental determinants in developmental steps. Some instinctive behaviors depend on maturational processes to appear. Thought to represent a quiescent maturational stage of secretory cells. Sovatsky adapts the concept of Kundalini as the maturational force of human development. The severity of immune neutropenia correlates with the maturational specificity of antineutrophil antibodies. These spurts are thought to reflect maturational events in the frontal areas of the brain. M capacity is the key maturational causal factor of working memory. According to Sovatsky these are maturational processes, affecting body and soul. Speaking and signing infants follow very similar maturational paths in language acquisition. In this regard, second language learning might be affected by a learner's maturational state .