A study by Renee Baillargeon (1987) demonstrates that infants as young as 3½ months

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Baillargeon's 1987 study is notable for showing that infants as young as 3½ months old have a rudimentary understanding of object permanence, which is the understanding that objects continue to exist even when they cannot be seen, heard, or otherwise sensed. This challenged the traditional Piagetian view that such understanding does not develop until much later.

A Study by Renee Baillargeon (1987) Demonstrates That Infants as Young