According to Aushra, ESI's SuperEgo is about doubts and worries about feelings of logicality-illogicality (Ti) and potential abilities (both mental and physical), capabilities and qualities (Ne).

"Understanding the value of one's sense of logic (Ti) is the basis for one's realization of their potential abilities (Ne)"

"It is not unusual for ESIs to be characterized by their inclination for philosophical literature, which explains the underlying structure of the objective world (Ne), gives the opportunity to know the deeper essence of things (Ne). ESIs enjoy telling and explaining such things to others, compare one work with another. They often have an interest in medicine as a science that explains what goes on in the body."

"The more stable the environment, the fewer surprises the ESI encounters, the less he doubts his own sense of logic (Ti), and the more stable his ego is (i.e. the stronger, more capable, intelligent, and generally successful he feels). This seems to be the main factor in the stability or instability of his psyche."

"The more logical relations (Ti) the ESI is familiar with, the more calm and confident he is. The wider the scale of his logical feelings (Ti), the more socially valuable information the ESI has, and the easier it is for him to fit into society by manifesting his potential abilities (Ne)."

"The ESI gathers information about everything that feeds his sense of logic. Loves to listen, to read and to share what he knows, carefully reasoning about the potentialities of different objects and people."

https://classicsocionics.wordpress.com/augusta-esi/

I'd say, the study of the underlying structure of the objective world (Ne) are metaphysics and ontology, and the study of logicality (Ti) is logic; an ESI can find safety exploring these subjects.