(p. 114) The two measures most frequently used to reflect an infant's awareness of a change in an event are the infant's level of activity and heart rate.

Answer the following statement true (T) or false (F)


True

Researchers have found that sounds of 5 to 15 seconds seem to have the most effect on an infant's level of activity and heart rate-the two measures most frequently used to reflect an infant's awareness of a change in an event. If the sound lasts more than several minutes, the infant becomes less responsive.

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Fill in the blank(s) with the appropriate word(s).

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