In the most mature level of cognitive development, attained in early adulthood, the various cognitive structures are used appropriately and efficiently. A scientist , for example, might use formal operations for work on a theoretical problem, concrete operations for everyday business transactions, preoperational thinking for artistic endeavors, and sensorimotor processes for intimate personal interactions (Riegel, 1973). In this last case, the sensorimotor actions and pleasures will be adult and not like those of the infant.
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