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Sensorimotor Stage
Piaget's first stage of development, in which infants use information from their senses and motor actions to learns about the world
Primary circular reactions
Piaget's phrase to describe a baby's simple repetitive actions in substage 2 of the sensorimotor stage organized around the baby's own body.
Secondary circular reactions
repetitive actions in substage 3 of the sensorimotor period oriented around external objects
Means-end behavior
purposeful behavior carried out in pursuit of a specific goal
Tertiary circular reactions
the deliberate experimentation with variations of previous actions that occurs in substage 5 of the sensorimotor period
Object permanence
the understanding that objects continue to exist when they can't be seen
A-not-B error
substage 4 infants' tendency to look for an object in the place where it was last seen (position A) rather than in the place to which they have seen a researcher move it (position B)
Deferred imitation
imitation that occurs in the absence of the model who first demonstrated it
Object concept
an infant's understanding of the nature of objects and how they behave
violation-of-expectations method
a research strategy in which researchers move an object in one way after having taught an infant to expect to move in another
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