A researcher who selects a sample of people of varying ages and studies them at one point in time is by definition, using a ______ design
a) cohort design
b) longitudinal design
c) lifespan design
d) cross-sectional design
ANS: D, A cross-sectional design studies several different age groups at the same time.
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Which of the following students provides the most accurate summary about phoneme pronunciation, as discussed in the section on speech perception?
a. George: "Humans manage to perceive the phoneme intended by the speaker, even though phoneme pronunciation is quite variable." b. Angela: "Humans tend to perceive phonemes inaccurately, but top-down processing helps to increase their accuracy." c. Jakob: "Humans have great difficulty with phoneme perception, because most speakers have sloppy phoneme pronunciation." d. Galit: "Each phoneme is pronounced in a consistent fashion, so that speech perception is remarkably accurate."
If we can apply Mark Rosenzweig's research on rats raised in impoverished or enriched environments to humans, then we would encourage humans to live in a(n)
a. environment that is deprived of unnecessary stimulation. b. environment that is full of stimulation when children, but not when adults. c. enriched environment even after childhood. d. stressful environment in order to strengthen the functioning of the hippocampus.