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Cognitive development
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==== Sensorimotor stage ==== Piaget believed that infants entered a sensorimotor stage which lasts from birth until age 2. In this stage, individuals use their senses to investigate and interact with their environment. Through this they develop coordination between the sensory input and motor responses. Piaget also theorized that this stage ended with the acquisition of [[object permanence]] and the emergence of symbolic thought. This view collapsed in the 1980s when research was put out showing that infants as young as five months are able to represent out-of-sight objects, as well their properties, such as number and rigidity.
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