Notes
1Specifically (as originally framed and labeled, followed by more current and elaborated terms, as per CitationGreenspan, DeGangi, and Wieder, 2001), these stages are: homeostasis (0–3 months) [later termed “self-regulation and interest in the world”], attachment (2–7 months) [“forming relationships, attachment, and engagement”], somatopsychological differentiation (3–10 months) [“two-way, purposeful communication”], behavioral organization-emergence of a complex self (10–18 months) [“behavioral organization, problem-solving, and internalization”], representational capacity and elaboration (1 –3 years) [same], and representational differentiation (2–4 years) [same, described as “building bridges between ideas and emotional thinking”].