Original: This field examines change across a broad range of topics including motor skills and other psycho-physiological processes ; cognitive development involving areas such as problem solving , moral understanding , and conceptual understanding ; language acquisition ; social , personality , and emotional development ; and self-concept and identity formation .
Simplified: Developmental psychology studies human change in a lot of areas , including motor skills ( and other processes that are both physical and psychological ) , problem solving abilities , understanding of concepts , learning language , moral understanding , and identity .