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Describe the sensory motor, preobservational, concrete observational, and formal observational stages.
The sensory motor is the period where infants know the world mostly through senses and actions.
The preobservational is when the world is representing things with words and images. This is using intuitive rather than logical reasoning.
The concrete observational is when an individual thinks logically about concrete events, and can grasp concrete analogies as well as perform math.
The formal observational is when an individual can perform abstract reasoning.