Introduction to Ti
Introverted logic is an introverted, rational, and static information element. It is also called Ti, L, structural logic, or white logic.
Ti is generally associated with the ability to recognize logical consistency and correctness, generate and apply classifications and systems, organize systematic and conceptual understanding, see logical connections between things (including logical similarities, differences, and correlations) by means of instinctive feelings of validity, symmetry, and even beauty. It is like common sense, in that it builds on one's expectations of reality, through a somewhat personal, though explicable, understanding of general truths and how they are manifested.
Types that value Ti naturally question the consistency of beliefs that are taken for granted in everyday life. They strongly prefer to make decisions based on their own experience and judgement, as opposed to relying on external authorities for knowledge, which they use only as a last resort. They also have respect for people with clearly defined and internally consistent opinions, believing that a sense of internal certainty is necessary for orienting oneself in life. To these types, one's personal standards of truth are more reliable than public consensus.
They see overly pragmatic views as shallow, and try to limit public discussion of mundane practical matters. They are especially sensitive to redundant information.
Ti as Leading Function (LSI, LII)
The individual views reality through the lens of logic, immediately recognizing the correctness and appropriateness of things and their proper place in reality and in his system of views and behavior. He freely makes logical assertions, often exaggerated, about new information and experience. He holds highest those rules to which exceptions do not exist, and is a habitual critic of people or things that don't follow a set of rules, whether they are those accepted by the community, or his own, or even the other person's. Although he is able to adopt others' rules, his own are always the last word, and these are subject to continual refinement. Often seen as "demanding", due to high standards.