Researchers take advantage of this fact by rigging up two rubber nipples, so that if a baby sucks on one, it hears a recording of its mother's voice on a pair of headphones, and if it sucks on the other nipple, it hears a recording of a female stranger's voice.
Hulumtuesit perfitojne nga ky fakt duke i mashtruar me dy biberona gome, nese nje bebe e pi ne nje e degjon regjistrimin e zerit te nenes me nje kaske degjuese, dhe nese pi nga biberoni tjeter degjon zerin e nje femre te pa njohur.