What does the difference in smiling rates between infants who are born premature and infants born on time tell us about the roots of the earliest smiles?
A) the first smiles are prompted by normal social relationships
B) beginning smiles requires advanced cognitive development
C) first smiles are controlled by older portions of the brain
D) first smiles require advanced motor control

Question

Quizplus · Accepted Answer

The difference in smiling rates between infants born premature and those born on time suggests that the earliest smiles are not dependent on social interaction or advanced cognitive or motor development, but rather are controlled by older, more primitive parts of the brain. This is because premature infants, despite their underdeveloped cognitive and motor skills, still smile, indicating that smiling is a basic, innate behavior.

What Does the Difference in Smiling Rates Between Infants Who