Various behaviors emerge at different ages. Of the following, which one is demonstrably present in infants less than one week old?

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Quizplus · Accepted Answer

Infants less than one week old are able to recognize their mother's voice through auditory preferences, as demonstrated by studies using pacifiers that play different sounds. The other behaviors listed typically emerge later in development. Mnemonic devices are usually developed in childhood or adolescence. Object permanence (the understanding that objects exist even when they are out of sight) is typically demonstrated at around 8 months of age, and conservation (the understanding that a quantity remains the same even when its appearance changes) is typically demonstrated at around 7 years of age.

Various Behaviors Emerge at Different Ages