| A) | Believed that adolescents have the cognitive ability to think about abstract ideas and hypothetical possibilities
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| B) | Conducted research on adolescent sleep patterns that showed that adolescents' periods of wakefulness shift by about one hour as they get older
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| C) | Believed the most important cognitive change in adolescence is improvement in executive functioning
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| D) | Proposed the "storm-and-stress" view that adolescence is a turbulent time charged with conflict and mood swings
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| E) | Theorized that adolescent egocentrism has two key components: the imaginary audience and the personal fable
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| F) | Believed that although adolescents are capable of very strong emotions, their prefrontal cortex isn't adequately developed to control these passions
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