Final answer:
Harry Stack Sullivan's work in psychology did not specifically outline 'three developmental cognitive modes' as is possibly being confused with Jean Piaget's stages of cognitive development.
Step-by-step explanation:
The question pertains to Harry Stack Sullivan's theory on developmental cognitive modes. However, there seems to be a mix-up. Sullivan did not specifically enumerate three developmental cognitive modes as described in theories by Jean Piaget or others mentioned. Harry Stack Sullivan's contributions to psychology were more focused on interpersonal relationships and psychological development through interactions with others. Sullivan's theory includes the concept of 'personifications,' 'self-system,' and 'interpersonal theory,' but these are not categorized neatly into three developmental cognitive modes as the student might be implying.
It is important to clarify with the student regarding the specifics of what they are asking about Sullivan's theories and if they are indeed looking for a tripartite categorization similar to Piaget's cognitive developmental stages or something else.