Piaget's stages of cognitive development include all EXCEPT:

Piaget's theory of cognitive development outlines four distinct stages through which children progress as they develop their ability to think and understand the world around them. These stages are the sensorimotor stage, preoperational stage, concrete operational stage, and formal operational stage. Each stage represents a different level of cognitive ability, with each stage building upon the previous one.

The formal operational stage involves the development of abstract thinking and problem-solving abilities. The preoperational stage is characterized by the development of language and symbolic thought, but logical reasoning is still limited. The concrete operational stage is when children begin to understand concrete logic and can perform operations on tangible objects.

The inclusion of a "behavioral adjustment stage" does not align with Piaget's recognized framework of cognitive development stages. Therefore, this choice stands out as incorrect, as it does not exist within Piaget's established stages. Understanding this distinction emphasizes the structure and defined stages of cognitive growth as proposed by Piaget, highlighting the importance of recognizing these specific terms in the study of developmental psychology.