When Alice speaks to her six-month-old nephew, her voice immediately takes on a higher pitch, her speech becomes slower, and she begins to use more simplistic words and phrases. This change in Alice's language behavior is an example of

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Alice's change in language behavior, including a higher pitch and simpler words and phrases, is typical of child-directed speech, which is when adults modify their language when speaking to infants and young children. This is done to make the language more accessible and understandable for the child. Echoing refers to repeating a child's words, while recasting involves rephrasing a child's statement in a different way. Morphology refers to the structure and formation of words.

When Alice Speaks to Her Six-Month-Old Nephew, Her Voice Immediately