12 years: Except for prefrontal lobe, layer two functions {brain development, 12 years}. Alpha waves dominate EEG. Central association areas and frontal lobes can function. Reticular formation completes myelination at puberty.
12 years: TV viewing peaks {cognition development, 12 years}.
12 years: Children average 1.50 meters and 38.5 kilograms {physical development, 12 years}. Most permanent teeth are in. Lymphoid tissue grows steadily until 11 or 12, and then growth rate declines.
adolescence
Average boy starts adolescence. Just before puberty, forehead becomes higher and wider, mouth widens, lips become fuller, and chin juts out more.
During adolescence, average male loses subcutaneous fat and increases muscle bulk. Subcutaneous-fat growth rate slows only in girls.
Growth in shoulder width is greater in males. Growth in pelvic breadth is similar between sexes.
rate
Children with fast early growth usually finish growing earlier, while late developers finish growing later. Growth is regular.
12 to 14 years: Adolescents understand metaphors {language development, adolescent}.
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Date Modified: 2022.0225