2 years: Fissures between brain lobes are present {brain development, 2 years}. Children have 75% of adult brain. Cerebellum is 80% of adult weight. Vertical exogenous fibers connect cortex with subcortex. Subcortical association fibers, layer-one tangential fibers, and horizontal exogenous fibers develop. Cortex layer 3b is functional and has thalamus and association-area tracts. Association-area outer sections are functional. Cortex motor tracts modify sense pathways.
2 years: Children do not know that minds have beliefs, hopes, and desires {cognition development, 2 years}. Children like to imitate, like to identify, can build towers of 6 to 7 blocks, can repeat two digits, can name doll body parts, and can tell objects by use. Young children first draw heads and then draw legs and arms. Two-year-old children attach arms to largest previous shape. When drawing, young children try to organize all lines into patterns, rather than copying real world.
24 months: Children like to have mother present {emotion development, 24 months}. Personality begins.
24 months: Children acquire grammar {language development, 24 months}. First, children combine verb and noun or adjective. Two-year-olds do not realize that they have thoughts or that speech has words. Vocabulary is 6 to 126 words.
24 months: Children average 0.8 meters and 12.5 kilograms {physical development, 24 months}. Handedness begins.
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Description of Outline of Knowledge Database
Date Modified: 2022.0225