Language areas activate {brain development, 18 months}. Pre-frontal lobes activate, along with self-consciousness.
First life stage {infancy} ends at 18 months.
18 months: Children can say 4 to 50 words, with average of 22 words {language development, 18 months}. Children make two-word phrases. Children have no frustration if not understood.
18 months: First, words stand for whole sentences {syncretic meaning}.
At age 18 months, pre-frontal lobes and language areas become active, and self-consciousness begins {self-consciousness, development}.
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Date Modified: 2022.0225