Initially infants are only able to bat at objects; they then learn to grasp objects utilizing the whole hand. Later, infants are able to pick up small objects with just the index finger and thumb. This illustrates the __________ principle.

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The principle of hierarchical integration is the principle that simple skills typically develop separately and independently but are later integrated into more complex skills. In this example, the ability to pick up things using the whole hand comes before the ability to manipulate things with the fingers alone.

Initially Infants Are Only Able to Bat at Objects; They