Developmental psychology is the scientific study of changes that occur in human beings over the course of their life span. Originally concerned with infants and children, the field has expanded to include adolescence, adult development, aging, and the entire life span. 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. Three major contexts to consider when analysing child psychology are: social context, cultural context, and socioeconomic context.
Developmental psychology includes issues such as the extent to which development occurs through the gradual accumulation of knowledge versus stage-like development, or the extent to which children are born with innate mental structures versus learning through experience. Many researchers are interested in the interaction between personal characteristics, the individual's behavior, and environmental factors including social context, and their impact on development; others take a more narrowly-focused approach.
The Demographics of Asia refers to the human population of Asia. The continent covers 29.4% of the Earth's land area and has a population of over 4 billion - accounting for about 56% of the world population. Together, China's and India's populations are estimated to be around 2.5 billion people.