The human being may be considered to have mental transitional spheres in which the sifting, transforming, intensifying, and inhibiting of stimuli are initiated. Stimuli essential to the development of the psychic apparatus are converted in the mental transitional spheres into a form that will enable them to exert the appropriate influence on the ego. Optimal ego development cannot take place without the proper functioning of these spheres. Thus, the mental transitional spheres are essential for the development of psychic functions and defenses.
人类可被认为具有心理过渡领域，在其中刺激的筛选、转化、强化和抑制得以启动。对心理器官发育至关重要的刺激在心理过渡领域被转化为一种形式，使其能够对自我施加适当影响。没有这些领域的正常运作，就无法实现最佳的自我发展。因此，心理过渡领域对心理功能和防御的发展至关重要。
