objects continue to exist when they are out of sight. This is developing at Substage 4.
Infants show_A not B search errors_: look for an object in hiding place A after the object is moved from A to B.
Babies as young as 3 ½ months may have a basic understanding of object permanence but a more full understanding comes gradually.
Tertiary Circular Reactions (12-18 most) Infants repeat actions with variation (tertiary) & explore more. Infants have a better understanding of object permanence. -EX: kids testing things out and doing things over and over to get different outcomes, throwing toys off a table to see what happens -EX: grabbing mobile hanging from above
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