B)Trained paraprofessionals were more effective than professional nurses in preventing
delayed mental development.
C)As kindergartners, program children scored higher in language, but lower in
intelligence, than comparison children.
D)From their baby’s birth on, home-visited mothers were on a more favorable life course
than comparison mothers.
In classical conditioning, if the conditioned stimulus is presented alone enough times,
without being paired with the unconditioned stimulus, __________ occurs.
A)habituation
B)extinction
C)imitation
D)recovery
Longitudinal research can identify common patterns as well as individual differences in
development because the investigator
A)studies groups of participants differing in age at the same point in time.
B)randomly assigns participants to treatment conditions.
C)tracks the performance of each person over time.
D)conducts quasi-experiments, comparing conditions that already exist.