When an amoeba is placed in a water solution contaminated with ink, it will absorb the ink and store it in small spaces in its body. Thus, the harmful material becomes part of the physiology of the cell. When the amoeba is transferred to clean water, the ink cavities migrate to the cell wall and are emitted. Thus the amoeba returns to her healthy state. In The Primal Scream, psychotherapist Arthur Janov wrote that the same happens with humans, as basic processes of striving to homoeostasis are common to all forms of organic life. When there exists early pain, the memory and the accompanying emotional baggage are stored within the cells of the centers of the emotional brain (the limbic system) waiting for their release. When the environment becomes warm and affectionate, and encourages the display of emotions, the old pain begins to be emitted from the body.