Final answer:
Carl Rogers' person-centered theory does not lay out specific developmental periods as Piaget's does; rather, it focuses on the lifelong psychological growth process, emphasizing congruence between the real self and ideal self, fostered by unconditional positive regard.
Step-by-step explanation:
Carl Rogers' person-centered theory doesn't specify developmental periods in the same way that stage theorists like Piaget, Freud, or Erikson do. Instead, Rogers focuses on the concept of self and psychological growth throughout a person's life. Rogers highlighted the importance of self-concept, which consists of our thoughts and feelings about ourselves. In his view, individuals thrive when there is congruence between their 'real self' (who they actually are) and their 'ideal self' (who they would like to be). Rogers stressed that achieving consistency between these aspects of self leads to higher self-worth and a more fulfilling life. He emphasized the role of unconditional positive regard from parents and others to foster congruence and psychological well-being. However, when referring to the 'periods' in person-centered theory, it would be more accurate to discuss the process of growth and the conditions that facilitate it, such as congruence, unconditional positive regard, and empathy, rather than chronological developmental stages.