Which of the following is not one of Piaget's stages of cognitive development?

The correct answer highlights an important aspect of Piaget's theory of cognitive development, which comprises four primary stages: the sensorimotor stage, the preoperational stage, the concrete operational stage, and the formal operational stage. The option referencing "cognitive changes during adult development" does not correspond to any specific stage in Piaget's framework.

Piaget's theory primarily focuses on childhood and adolescence, detailing how cognitive abilities develop systematically as individuals interact with their environment. He did not explicitly outline stages that address cognitive development in adulthood. While it is acknowledged that cognitive changes can occur during adult years, these are not encapsulated within Piaget's established stages, indicating that the option regarding adult development does not fit within his theoretical model.

Understanding Piaget's framework helps clarify the distinction between his defined stages, which are sequential phases in childhood cognitive development, and broader concepts of cognitive changes that may occur later in life, possibly influenced by factors such as education, experience, or aging.