Introverted Sensing: Understanding the Si function (8 Signs )

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This is going to be the first article in a series where I’ll be going over the 8 cognitive functions, identifying them in the simplest way I can, and offering signs of having each function.

Since I aim to make my introverted (and even extroverted ) readers get more insight into their personality type and the qualities that come with each personality.

Now, let’s dive right in!

What is Introverted Sensing (Si)?


Introverted sensing (Si) is one of the 4 perceiving functions (the other 3 being Extroverted sensing (Se), Introverted intuition (Ni), and Extroverted intuition (Ne)),

It is considered to be an introverted function which means that the information is gathered from within the person’s own mind and as such very subjective.

The Si Function is all about using one’s internal memories and similar past experiences to give meaning to anything they’re currently doing.

So what sets Si users apart from the other types then?

Si users tend to have an uncanny sense of detail and they use their vivid memories to determine the way they understand and interact with the world around them.

They are known to have a strong memory of past events, often with vivid details of what was taking place.

Unlike Ni users, people with Si function prefer to focus on the physical and tangible world. They’re skeptical of anything that cannot be proven by tangible evidence.

  • (Si) is the dominant function of ISJ personality types: ISTJ, ISFJ
  • (Si) is the auxiliary function of ESJ personality types: ESTJ, ESFJ

To give you more understanding of how an introverted sensing type uses this perceiving function, here are some…

Introverted Sensing Examples:

  • An introverted sensor will most likely remember every detail of their 3rd-grade school trip, even if it happened a decade ago and they’ll even remember how they felt that day.
  • A mother with a dominant Si function will likely perceive Holidays as sacred events because she’d vividly remember how the family gets together and how the house fills with laughter and children’s noise when she thinks about holidays.
  • A Chef with a dominant Si function will know the precise way to cook a rare steak, when will it be ready to turn, and how to keep the heat just by vividly recalling cooking it in the past.

8 Signs That Will Help You Identify Yourself as an Introverted Sensor!

  1. You’re able to find the word that perfectly describes how you feel.

And I mean exactly describe it, no other words but the word you thought of will do! You know if a place feels homey or not and you can even give its level of comfort and pleasantness.

  1. You Like to Compare a lot.

You like to compare prices, foods you eat, the way things smell. Even how people act today compared to last week.

You love comparing your current situation with how it was in the past especially if there’s a difference between them.

  1. You like to plan things out.

You prefer planning your day ahead and expecting what will happen in your day.

You always know what needs to be done next because of your past experiences.

You’re also a routine person, meaning you like to have a set of daily habits that you anticipate doing and will be thrown off if anything goes wrong with your routine.

  1. You have a strong memory

You can easily remember names, numbers, things you’ve seen, places you’ve been to, people you’re familiar with.

You store every single detail about that person in your memory for future references so next time you have a glimpse of that person even after years, you won’t have any trouble recognizing them.

  1. Your past memories affect how you perceive things around you now

If something happens today that reminds you of an event or someone from your past, it will affect your reaction to the current situation.

whether it’s in a positive or negative way, you always expect things to be the way they were based on how you’ve experienced them in the past.

  1. You’re a very detail-oriented person

You pay attention to details more than most people.

what colors are used, how things smell, their texture, the way they taste, how they sound, etc.

You notice all these little details and it makes your world more vivid because of its richness to you.

  1. You enjoy reliving Good memories

The introverted sensing types are very nostalgic, meaning they enjoy re-experiencing good memories.

And if you have a dominant Si, you tend to re-watch your favorite movies or songs from the past, go back to the places you’ve been before, and even read a piece of fiction from your childhood.

  1. You actually learn from your past mistakes

Your senses will strongly prevent you from repeating an act that you perceive as a mistake again, which is why you learn from your past mistakes quickly compared to other people around you.


I hope this article had helped you discover more about this perceiving function if you think you’re an introverted sensor.

If you’re struggling with your Personality Type then you should probably take the MBTI Questionnaire to get insight into your personality type.

I’ll be writing more articles about each cognitive function of the MBTI so make sure to check them when they’re posted!

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Sarra is a behavioral science student and HS science teacher ( also a cat mom! ) who obsesses over typing people but can't seem to type her own self. Let's just say that for the time being, she's a cross between an INFJ and INFP!

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