"Me" (which was later translated into English in 1958, titled, "The Ego and the Problem of Adaptation"). Hartmann focused on the adaptive progression of the ego "through the mastery of new demands and tasks". In fact, according to his adaptive point of view, once infants were born they have the ability to be able to cope with the demands of their surroundings. In his wake, ego psychology further stressed "the development of the personality and of 'ego-strengths'...adaptation to social realities". Object relations Emotional intelligence has stressed the importance of "the capacity to soothe oneself, to shake off rampant anxiety, gloom, or irritability....People who are poor in this ability are constantly battling feelings of distress, while those who excel in it can bounce back far more quickly from life's setbacks and upsets". From this perspective, "the art of soothing ourselves is a fundamental life skill; some psychoanalytic thinkers, such as John Bowlby and D. W. Winnicott see this as the most essential of all psychic tools." Object relations theory has examined the childhood development both of "[i]ndependent coping...capacity for self-soothing", and of "[a]ided coping. Emotion-focused coping in infancy is often accomplished through the assistance of an adult." Gender differences Gender differences in coping strategies are the ways in which men and women differ in managing psychological stress. There is evidence that males often develop stress due to their careers, whereas females often encounter stress due to issues in interpersonal relationships. Early studies indicated that "there were gender differences in the sources of stressors, but gender differences in coping were relatively small after controlling for the source of stressors"; and more recent work has similarly revealed "small differences between women's and men's coping strategies when studying individuals in similar situations." In general, such differences as exist indicate that women tend to employ emotion-focused coping and the "tend-and-befriend" response to stress, whereas men tend to use problem-focused coping and the "fight-or-flight" response, perhaps because societal standards encourage men to be more individualistic, while women are often expected to be interpersonal. An alternative explanation for the aforementioned differences involves genetic factors. The degree to which genetic factors and social conditioning influence behavior, is the subject of ongoing debate. Physiological basis Hormones also play a part in stress management. Cortisol, a stress hormone, was found to be elevated in males during stressful situations. In females, however, cortisol levels were decreased in stressful situations, and instead,