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In this video I begin describing the 4 stages of Piaget's theory of cognitive development: sensorimotor, preoperational, concrete operational, and formal operational. Then I provide details of the sensorimotor stage along with more recent research suggesting that infant understanding of the world may be more detailed than Piaget proposed.

Infant demonstrating the A-not-B error: https://www.youtube.com/watch?v=lhHkJ3InQOE

Scientific American Frontiers video with Renee Baillargeon: https://www.youtube.com/watch?v=b1tQOR5L0iI

Video explaining the mark test (or rouge test) for self-consciousness: https://www.youtube.com/watch?v=d0wKP--2Wrc&list=PLkKvotUGCyLcZtfiLh3ogTRgeMDlj21LB&index=2

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Check out my full psychology guide: Master Introductory Psychology: http://amzn.to/2eTqm5s