Already have the beginnings of a vocabulary. (Pease, Barbara and Allan. Why Men Don’t Listen and Women Can’t Read Maps. NY: Broadway Books, 1998, pp 74-75)

By 18 months can imitate observed human actions (e.g., pulling apart a toy dumbbell) but will ignore the same actions if carried out by a mechanical device. (Restak, Richard, MD. The New Brain. PA: Rodale, 2003, pp 34-35)

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