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Direct sensory and motor contact. lack of object permamanence in early infancy, develops in toddler stage. Separation anxiety develops
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Child uses pretend play. The child is egocentric. The child words and images to respresent things and cannot yet reason logically.
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The child understands conservation and can think logically. They no longer act in pretend play.
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The adolescant can reason, think abstractly, think hypothetically, logically, and fully understands conservation