This chain quest looks into the neurology that comes about related to the cognitive functions. This video 8/8 is on Introverted Sensing dominants, ISTJ and ISFJ.

Introverted Sensing is often thought of as a storage facility or database filled with real memories and experiences. When you use Introverted Sensing, you recall the memories with vivid details. People describe the experiences coming back like movie clips or photos.

An Introverted Sensing dominant, ISTJ and ISFJ, relies heavily on the details from the past to inform the present. This then is used to guide decisions and encourage the Si type to maintain a reliable structure that can extend into the future. ESTJs and ESFJs do this too, but Introverted Sensing is their auxiliary function, so it's not necessarily the main viewpoint that they rely on. But still, all four of these types prefer Si as their primary way of perceiving and learning about the world.

They compare what’s happening now, or how something tangibly is, with their personal experiences. All of their experiences combine to make an ideal representation of something — how it is at its best. The ideal version of an apple, for example, is based on all other apples experienced. Through taking in all the tangible details, we learn what color, texture, shine, weight, firmness, and taste an apple should be at its purest form.

A behavior that often comes from preferring Introverted Sensing is to stick with what works. Si naturally likes things to be predictable. The easiest way to maintain stability is to not deviate

The polar opposite of Introverted Sensing is Extroverted iNtuition. This is a preference to skip over the fine details and abstractly explore every possibility available. Ne naturally works against and avoids routine. So, you can imagine that Si types generally keep their life orderly.

INFPs have introverted Sensing in their tertiary position. It's generally not well developed, so I'll give you an example of what it's like at a… lower... functioning level. I often eat the same food, prefer a specific coffee, and have a rigid morning routine. I don't want to "risk" eating something when I'm sure I already like the Italian Cheese-in-Hamburg - so why do it?

At a healthy, dominant level, Si allows the user to focus on what is important to uphold traditions and the foundation for human survival. They keep us safe through recognizing what realistically needs to happen.
In RPG terms, Introverted Sensing types are like warriors spec’d into a tanking, guardian role. They are determined to hold more than their share of a burden in order to get something done correctly.

Main brain regions used:
Fp2 – “process manager” or "curious explorer"
T5 – “sensitive mediator” or "sensitive adjuster"
T6 – “purposeful futurist” or "insightful futurist"
01 – “visual engineer”
02 – “abstract impressionist”

If this interests you, go to www.darionardi.com and buy his book(s).

Neuroscience of Personality: Brain Savvy Insights For All Types of People by Dario Nardi

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