The 3-year-old process – also called the inferior function or blind spot – is supposed to be the weakest part of our cognitive function stack. Logically, it would seem like it would be easy to control or suppress and shouldn’t cause issues in everyday life. Why, then, do we sometimes find it being “naughty”?

Whether or not we are consciously using a function, it is running. We cannot turn them off any more than we can turn off our right foot by focusing on drawing a tree. Since it is always running, the 3-year-old process frequently spots and wants to point out information of value. For instance, a 3-year-old Extraverted Intuition (“Exploration”) might realize that a new route to work could be more efficient even while the driver process, Introverted Sensing (“Memory”), plows on because the highway has been established as the best way to get there. The Driver process has so much connection to the consciousness that it frequently and reflexively suppresses the 3-year-old, just like a parent telling their child that they know best.

Henry is an INTP. His driver process is Introverted Thinking (“Accuracy”), and his 3-year-old process is Extraverted Feeling (“Harmony”). Henry and his mom talk on the phone regularly, and his mom has come to respect his knowledge of science and frequently asks about it to engage him. Something that has come up recently is that Henry’s mom does not think that quantum mechanics makes sense. She believes it is inconsistent and it only exists to try to disprove God. Henry patiently explains to his mom how quantum mechanics works, in an effort to educate her and give her the information that he knows will help her understand. Whenever they talk, Henry pushes his mom to listen more and understand because it’s an interesting, cohesive theory. Every time, his mom gets more and more frustrated and reactive. Henry’s Harmony function keeps tugging on his shirt saying “I don’t think you should push this!” but Henry’s Accuracy function knows that this theory is right and wants his mom to understand. Over time, tension and passive-aggression enter the phone calls until his mom starts calling less frequently. Henry can’t figure out what happened! The calls were always interesting to him. If Harmony could have been heard from the beginning, the tension never would have crept into the relationship.

Often, 3-year-olds are NOT listened to because they are not trusted. Most people learn that the Driver process can accomplish the same thing as the 3-year-old but is far better at it. The Driver process has so much energy behind it that it can suppress the 3-year-old for a very long time and about very important things. But what happens when the Driver process becomes overtaxed? The kids are both sick, and a work deadline is coming up. The Driver process does everything it can, just barely scrapes by, and collapses on the psychological sofa. It doesn’t have the energy to suppress the 3-year-old today like it usually does. All this time, the 3-year-old has been getting more and more upset that its viewpoint has been ignored, the parents don’t have the energy to control it anymore, and so it explodes in a tantrum.

This tantrum is called the “Inferior Grip.” A typically interested, outgoing, Exploration person (ENxP) might find herself wanting to curl up in a blanket and eat comfort food. A frequently giving, people-oriented Harmony person (ExFJ) might find himself stuck in his own head, paralyzed into inaction and argumentative. We find ourselves giving our 3-year-old TV time, candy, and new toys in the hopes that he will calm down so we can finally just lay on the sofa and relax.

How can we prevent this “Grip” experience?

It requires a shift in the way we treat the 3-year-old. I can’t claim to have read every child-rearing book out there, but I’ve never seen one that says: “Keep your toddler quiet with brute force whenever possible. When you can’t, give her treats until she gets quiet again. Repeat this pattern indefinitely.”

If the 3-year-old function didn’t serve a purpose, we wouldn’t have it. It exists to balance out our dominant function by doing things that our Driver simply cannot do.What we want to do to work with our 3-year-old will vary greatly. Maybe an ISTP will want to utilize her Harmony function to learn how to be a perfect fur-mom for her puppy. Maybe an ISFJ will want to try out new kinds of food to help her lose weight and still enjoy her lunch at work. Maybe an INTJ will want to learn to experience each different instrument in a song to help him be a better DJ.

The name “3-year-old” can sometimes trip people up about the abilities of this function. It DOES learn at the rate of a 3-year-old, but it stays three years old for a very long time, unlike a 3-year-old human. If a toddler could stay at age 3 for 20 years, he could get really good at building Legos! Maybe we still wouldn’t trust him to drive the car, though.

There are some things that even a 3-year-old can do better than their parent.

What might it look like to develop a 3-year-old for each Driver process?

  • An INFJ (“Perspectives” Driver, “Sensation” 3-year-old) may want to learn mindfulness meditation to re-center herself during emotionally draining interactions.
  • An ENTP (“Exploration” Driver, “Memory” 3-year-old) may decide that sticking to a weekly workout schedule is the best way for him to finally get in shape for snowboarding.
  • An ESFP (“Sensation” Driver, “Perspectives” 3-year-old) might decide that their philosophy of personal responsibility doesn’t quite make sense in light of new experiences. Reflecting on how people make choices could help her forgive her father’s alcoholism.
  • An ISTJ (“Memory” Driver, “Exploration” 3-year-old) might learn to love traveling as a way to bond with her adventurous daughter over their yearly trip overseas.
  • An ISTP (“Accuracy” Driver, “Harmony” 3-year-old) might want to spend time connecting with his autistic sister to make sure she feels safe at large family gatherings.
  • An INFP (“Authenticity” Driver, “Effectiveness” 3-year-old) might take on a consulting job restructuring a school budget to make sure that impoverished children still get to eat lunch.
  • An ENFJ (“Harmony” Driver, “Accuracy” 3-year-old) might read endless books on child-rearing to ensure that they have multiple techniques and theories to draw from in figuring out why their child refuses solid food.
  • An ESTJ (“Effectiveness” Driver, “Authenticity” 3-year-old) might spend some time reflecting on the direction of her fracking company and how she can use some of the profits to offset the environmental damage.

What are the steps for integrating the 3-year-old?

  1. Decide where you value YOUR 3-year-old. This will be different for everyone based on your type and your personal values. Stick to that decision and honor this part of you.
  2. At times when you need to suppress your 3-year-old, as life often requires us to, make sure to respond to its needs as soon as possible.
  3. Be patient. Skill progression is naturally slow in this arena.
  4. Make the tasks fit the skill level. If you tried to teach an Accuracy 3-year-old how to do differential equations, it would feel stressed, defeated, and eventually would act out.

Any system works best when all parts are contributing. Road trips are so much more fun when you’re playing “I Spy” with the kids compared to sitting in silence.


  • Mckan
    • Mckan
    • April 21, 2021 at 1:29 am

    Developing Harmony as an INFJ at least have been about learning more about social cues and basic behaviors. When I meet new people, I tend to just learn more about them instead of trying to upstage others.

    Other things are being able to let my guard down, tell jokes that aren’t offensive when meeting new people and set boundaries by saying no.

    So I can imagine as an INTP… the best thing to start doing would be doing a nice gesture for someone close to you without needing a reason just to make that person happy.

  • Aerin
    • Aerin
    • October 21, 2018 at 3:55 pm

    My 3 year old flower girl has a decent voice in the car, though the rest of my functions will give her the side eye at times – okay, most times. I use Ti and Ne to take her around to view the sights. In other words, curiosity guides my social interactions. This easily creates a win-win situation because people like to be listened to. Over time, a growing understanding has led to an abiding fondness for people, and mankind in general. If I’m knee deep in another subject of interest, however, the flower girl is hushed. At that point it takes a herculean effort to drop research to answer social calls because, as I hypothesize, Si and Fe have teamed up to prohibit interaction unless I have the energy to exhibit a genuine, polite and warm manner (“they deserve nothing less,” says my Fe). I’ve gained more energy as I’ve gotten older, but it’s still pretty limited. Ultimately, the flower girl is a beloved passenger, the others find her adorable, but none of them want her to drive the car.

  • Olivia
    • Olivia
    • October 20, 2018 at 7:10 pm

    Same question!

  • Ji
    • Ji
    • June 17, 2018 at 12:24 am

    INTP here. How can I develop my 3 yr old Harmony?

  • Sam Goodkind
    • Sam Goodkind
    • July 29, 2017 at 9:38 pm

    Thanks, Aurelia! Always nice to be appreciated :)

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