| A) | Infants as young as 4 months expect objects to be substantial and permanent.
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| B) | Demonstrated detailed memory in 2- to 3-month-old infants.
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| C) | Devised the most commonly used infant intelligence test.
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| D) | Argued that explicit memory does not occur until the second half of first year.
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| E) | Believes humans are biologically prewired to learn language.
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| F) | Studied imitation and deferred imitation by infants.
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| G) | No evidence supports reinforcement as responsible for language rule systems.
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| H) | Developed a clinical measure to assess potential abnormality in infants.
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| I) | Contributed to cognitive theory by observing his three children.
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