The concept refers not only to the people one interacts with in the external world but also to significant others who are remembered and represented within the mind. Adequate functioning implies the ability to maintain a basically positive view of the other, even when one feels disappointed, frustrated, or angered by the other's behavior. Disturbances in object relations may manifest themselves through an inability to fall in love, emotional coldness, lack of interest in or withdrawal from interactions with others, intense dependency, and/or an excessive need to control relationships (Berzhoff, Flanagan, & Hertz, 2011). Self-esteem regulation involves the capacity to maintain a steady and reasonable level of positive self-regard in the face of distressing or frustrating external events. Painful affective states, including anxiety, depression, shame, and guilt, as well as exhilarating emotions such as triumph, glee, and ecstasy may also undermine self-esteem. Generally speaking, in dominant American culture a measured expression of both pain and pleasure is expressed; excess in either direction is a cause for concern. White Western culture tends to assume that individuals will maintain a consistent and steadily level of self-esteem, regardless of external events or internally generated feeling states (Berzhoff, Flanagan, & Hertz, 2011). Mastery when conceptualized as an ego function, mastery reflects the epigenetic view that individuals achieve more advanced levels of ego organization by mastering successive developmental challenges. Each stage of psychosexual development (oral, anal, phallic, genital) presents a particular challenge that must be adequately addressed before the individual can move on to the next higher stage. By mastering stage-specific challenges, the ego gains strength in relations to the other structures of the mind and thereby becomes more effective in organizing and synthesizing mental processes. Freud expressed this principle in his statement, “Where id was, shall ego be.” An undeveloped capacity for mastery can be seen, for example, in infants who have not been adequately nourished, stimulated, and protected during the first year of life, in the oral stage of development. When they enter the anal stage, such infants are not well prepared to learn socially acceptable behavior or to control the pleasure they derive from defecating at will. As a result, some of them will experience delays in achieving bowel control and will have difficulty in controlling temper tantrums, while others will sink into a passive, joyless compliance with parental demands that compromises their ability to explore, learn, and become physically competent. Conversely, infants who have been well gratified and adequately stimulated during the oral stage enter the anal stage feeling relatively secure and confident.