Nhận biết (M1)

Many believe that lullabies, characterized by their less steady beat, contain some acoustic features that are universally calming to infants. In a study, Constance M. Bainbridge and colleagues played both a lullaby sung in the Western Nahuatl language and a non-lullaby sung in the Serbian language to a group of infants. The researchers also measured the infants' heart rates, as a reduced heart rate is considered a measure of relaxation. They claim that the lullaby did indeed relax the infants.

Which finding, if true, would most directly support Bainbridge and colleagues' claim?

• A.

  The heart rates of infants in the study were more irregular during the lullabies than during non-lullabies.

• B.

  Parents of infants in the study chose the lullaby over the non-lullaby when asked which song they would use to calm their child.

• C.

  Infants' heart rates were substantially lower during the lullaby than during the non-lullaby.

• D.

  Both the song in Western Nahuatl and the song in Serbian were sung by a female singer.