Most Replayed Moment: The 4 Personalities Living In Your Brain! How To Switch Between Them

June 19, 2026

AI Summary

5 min read

The Four Personalities Inside Your Brain

The human brain is not a single unified consciousness but a collection of four distinct "personalities" — two emotional systems and two thinking systems, split across the left and right hemispheres. This is the central argument from neuroscientist Jill Bolte Taylor, who explains that each of these four characters has its own job, its own timeline, and its own way of experiencing the world. And crucially, you can learn to switch between them.

The Anatomy of Four Selves

Taylor begins with basic brain anatomy. The left hemisphere operates with linearity across time — it remembers the past, projects into the future, and houses your sense of individual identity. "I, me, I exist," she says of the left thinking system. This is the part that judges right and wrong, organizes your to-do list, and controls language, reading, writing, and mathematics. She calls this "character one" — the A-type personality that goes to work and fits into society. She named her own "Helen Wheels."

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What you'll learn

1 (01:04) **The Four Personalities Framework Introduced** - The guest (Dr. Jill Bolte Taylor) introduces the idea that there are four distinct "personalities" or modules living in every human brain, rooted in specific anatomy.
2 (03:51) **Defining the Four Characters: The Two Thinking Systems** - Dr. Taylor names and describes the two thinking (cortical) characters.
3 (06:52) **Defining the Four Characters: The Two Emotional Systems** - Dr. Taylor names and describes the two emotional (limbic) characters.
4 (10:03) **The Foundation of All Healing: Neuroplasticity & Awe** - Dr. Taylor explains that neuroplasticity is the underlying mechanism for change, and that the core of character four is a sense of awe at the miracle of existence.
5 (16:56) **Live Demonstration: Hemispheric Switching with Glasses** - Dr. Taylor uses specialized glasses to demonstrate how to preferentially stimulate the left or right hemisphere.
6 (21:28) **The Practice: How to Actively Switch Between Personalities** - Steven asks for a practical method to control these four characters for effectiveness. Dr. Taylor outlines a two-step practice.
7 (25:32) **The Core Message: We Are Designed for All Four** - Dr. Taylor concludes that the beauty of being human is having all four parts, but we typically function with only one online.

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Show Notes

Dr Jill Bolte Taylor is a Harvard-trained neuroscientist and bestselling author known for her work on the brain, consciousness and recovery after stroke. In this moment, she explains the four “personalities” inside every brain, where trauma, addiction and emotional reactivity live, and how understanding your left and right hemispheres could help you feel calmer, more focused and more in control.

Listen to the full episode here!

Spotify: https://g2ul0.app.link/lV13mTW7w3b

Apple: https://g2ul0.app.link/e/OK4itZY7w3b

Watch the Episodes On YouTube: ⁠⁠https://www.youtube.com/c/%20TheDiaryOfACEO/videos

Dr Jill Bolte Taylor: https://drjilltaylor.com/