Studies on infants' recognition of their mothers show that
a. infants recognize their mother's face for the first time when they are about 4 months old.
b. infants can recognize their mother's face and voice before they reach the age of 1 week.
c. it is so difficult to test infants' memory that we cannot test infants' face or voice recognition until they are about 2 months of age.
d. infants' perceptual skills are so limited that they cannot recognize either the face or the voice of their mother until 6 months of age.
Ans: b
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