In a research study on newborn preferences, how did the researchers determine that a newborn preferred their mother's face over another woman's face?

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Newborns' preference for their mother's face over another woman's face is often determined by measuring the duration of gaze. Researchers have found that newborns tend to stare longer at their mother's face, indicating a preference. This method is based on the understanding that infants are more likely to look longer at stimuli they find more interesting or comforting.

In a Research Study on Newborn Preferences, How Did the Researchers