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Unformatted text preview: hyperactivity; mental retardate. Milder cases normal but have moderate deficits in language, memory, coordination Capabilities of newborns Babies probably have core knowledge about objects and physics of objects; can distinguish human faces from any other object; can imitate Cross-sectional vs. longitudinal studies Cross-sectional: compares groups of individuals of different ages at the same time;several groups of subjects of various ages studied at one time. Its quick, no risk of confusing age effects with effects of changes in society. Risk of sampling error by selecting different kinds of people and of cohort effects Longitudinal: follows single group of individuals as they develop; one group of subjects studied repeatedly as they develop. Can study effects of one experience on later development, no risk of sampling differences. Takes a long time some participants quit, sometimes hard to separate effects of age from changes in societ...
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- Fall '08