When talking to their baby, Mr. and Mrs. Phiri speak slowly in sing-songy baby talk. This is called
a. hyperbolic receptive language.
b. metalinguistic vocalization.
c. primatological regression.
d. motherese.
Question 2
A strength of the longitudinal design is its ability to identify
a. cohort effects.
b. gender differences between girls and boys.
c. long-term individual differences among children.
d. ethnographic differences in multicultural populations.