According to the humanistic psychologist Abraham Maslow, as material wealth becomes decreasingly relevant to personal happiness, the desire for "belonging" "self-esteem" and "self satisfaction" becomes more important. Maslow believed that people are not controlled by mechanical forces (the stimuli and reinforcement forces of behaviorism) or unconscious instinctual impulses of psychoanalysis alone. Placing actualization into a hierarchy of motivation was a groundbreaking idea. Self actualization, as Maslow called it, is the highest drive, but before a person can turn to it, he or she must satisfy other, lower motivations like hunger, safety and belonging. The hierarchy has five levels. Physiological (hunger, thirst, shelter, sex, etc.). Safety (security, protection from physical and emotional harm). Social (affection, belonging, acceptance, friendship). Esteem (also called ego). The internal ones are self respect, autonomy, achievement and the external ones are status, recognition, attention. Self actualization (doing things).