What EEG Scans Reveal About Your MBTI Type

We all know an INFP who lives in their imagination. But what if you could see that imagination light up on a brain scan? Dario Nardi's research suggests you can.

The Moment of Realization

I remember sitting in a cramped café, surrounded by students, when a conversation caught my attention. One student, an INFP, was passionately sharing how her identity was intertwined with her creative pursuits. The difference was stark. The INFP, all creative identity. The INTP, pure analytical logic. Both were valid. And completely different.

What happened next was serendipitous. I stumbled upon Dario Nardi's research on EEG brain scans, which suggested that specific personality types activate distinct brain regions during different tasks.

Nardi (2013) conducted a study involving nearly 70 subjects, revealing that individuals sharing the same four-letter MBTI type consistently relied on similar brain regions for specific tasks. For instance, INFPs engaged areas linked to identity and imagination, while INTPs activated regions associated with reasoning and deduction.

Discoveries Through EEG

Looking at Nardi's EEG research in 2020, I found that each of the eight Jungian cognitive processes correlates with distinct patterns of electrical activity in the neocortex. This was groundbreaking! It provided empirical evidence for Jung's theories of personality types, which had long been based on observational insights.

The science confirmed something significant: our cognitive functions aren't just abstract concepts; they have tangible, measurable effects on our brain activity. This raises an intriguing question—could we train our cognitive functions just like we train our muscles?

The evidence is mixed on whether these brain patterns can definitively predict behavior, but they certainly illuminate the ways we process information.

A Personal Encounter with Cognitive Differences

I had the chance to observe this firsthand during a group project with students of various personality types. One of my students, an INFJ, excelled at synthesizing complex ideas into coherent narratives. Meanwhile, another student, an INFP, seemed more attuned to the emotional resonance of our topics, emphasizing the impact of our project on the community.

Their different approaches made me realize that our cognitive functions shape not just how we think, but how we interact with each other. Nardi's findings on the differentiation between INFPs and INFJs further illustrated this point. He highlighted that INFPs show strong activity in auditory regions when listening, while INFJs focus more on word content and meaning.

The Limitations of EEG Research

While I was excited by these insights, I also recognized the limitations of EEG research. The evidence here is compelling, but it often correlates rather than establishes causal relationships between brain activity and cognitive functions. Also, individual variations exist within personality types. Just because INFPs generally engage certain brain regions doesn't mean every INFP will exhibit the same patterns.

I recalled a conversation with my friend Marcus, an INTP, who often felt misunderstood because he didn’t always fit the mold of his type. His experiences made me realize that while research provides frameworks, the complexity of human behavior often defies neat categorizations.

How to Spot Your Own Cognitive Functions

Understanding your own cognitive functions can be a game-changing experience. Here are a couple of exercises to get you started:

1. The 60-Second Brain Dump: Set a timer and write down everything you're thinking. Is it a logical analysis (Ti) or a web of personal values (Fi)?

2. The Explanation Test: Try to explain a complex topic to a friend. Do you use a step-by-step process (Te) or a holistic metaphor (Ni)?

What This Means for You

Writing this piece has made me reflect on my own personality journey. I’ve learned that understanding cognitive functions is not just about fitting into a box; it’s about recognizing the unique neural signatures that shape our thoughts and actions.

I’m still left with questions, though. How do we account for the many influences on personality—cultural, situational, and developmental? As I move forward in my work, I’m committed to exploring these complexities, connecting research and real-world applications.