Newborn infants
a. have difficulty recognizing the voice of their mothers.
b. are unable to hear voices in the womb.
c. are unable to differentiate their mothers' voice from the voice of a stranger until 6 months of age.
d. can recognize the voices of their parents.
e. are deaf.
Answer: d. can recognize the voices of their parents.
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In a drug experiment, all participants are given the same instructions, and everyone gets a pill or injection with the participants in the experimental group receiving the experimental drug, and those in the control group receiving a placebo. Although the experimenter knows which subjects are in the experimental group and which are in the control group, the subjects themselves do not know who is
in which group or who received the real drug and who the placebo. This experimenter is using a. a double-blind study to control for researcher bias. b. a single-blind study to control for research participant bias. c. random selection to control the extraneous variables. d. random assignment to control the dependent variables.
When a child understands that people have mental states, such as thoughts, beliefs, and intentions, and that other people's mental states can be different from his or her own, we say that the child has developed
a. animism. b. egocentric thought. c. theory of mind. d. conservation.