Luis learned to raise his head off the floor when he was placed on his stomach. He then learned how to sit unattended and to rock back and forth using his arms and legs before he finally learned how to crawl. This illustrates the principle of __________.

Question

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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, Luis learned first to sit and rock before crawling.

Luis Learned to Raise His Head Off the Floor When