Jun 19, 2026 · 27 min
Neuroscientist maps the four distinct personalities governing your brain
Most Replayed Moment: The 4 Personalities Living In Your Brain! How To Switch Between Them
Understanding the anatomical division of our cognitive and emotional faculties allows us to consciously reduce stress and dictate our mental state.
- 1The brain contains four specific personalities split between left and right thinking and emotional systems.
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Steven Bartlett undergoes a live brain stimulation experiment using specialized glasses to trigger different hemispheres.
The brief
Harvard-trained neuroscientist Dr. Jill Bolte Taylor reveals that our brains house four distinct characters across both hemispheres, each governing specific aspects of our emotions, focus, and daily behavior.
These internal personalities represent left thinking, left emotion, right emotion, and right thinking, driving everything from our past pain to our ability to remain anchored in the present moment.
To demonstrate how these systems function, host Steven Bartlett participates in a live experiment using specialized glasses to selectively stimulate his brain hemispheres with light, altering his focus.
By practicing a structured brain huddle, individuals can learn to consciously recognize and switch between these four internal characters to regulate stress and regain emotional control.
What was said on this episode
20 statements · 12 positive · 1 negative · 7 neutral
The amygdala constantly scans for safety threats.
“The amygdala. Yeah, there's a group of cells right there that is scanning constantly. Am I safe?”
Listen at 2:36
The left hemisphere identifies a snake and initiates avoidance.
“And then the left hemisphere is going, oh, my gosh, it's a snake. No, I'm not safe. Push it away.”
Listen at 3:08
Calm amygdala activity enables learning and focus.
“And when the amygdala are calm and you feel safe now you can learn and focus.”
Listen at 3:22
Destroying an amygdala eliminates fear.
“If you wipe out an amygdala, you're not going to feel any fear.”
Listen at 3:35
The brain contains two emotional and two thinking systems.
“So we have these two emotional systems, and then we have these two thinking systems.”
Listen at 4:47
Thinking systems distinguish humans from other mammals.
“And the thinking system is what distinguish us as humans from all other mammals.”
Listen at 4:51
Character One handles judgments, social fit, and verbal communication.
“She is all about what is right and wrong and good and bad. How do I fit myself into a society, how do I use my words in order to communicate?”
Listen at 6:09
Character Four represents wisdom built through experience and neuroplasticity.
“This is our wisdom. We go and we have experiences and we learn because neuroplasticity is real”
Listen at 9:12
Neuroplasticity underlies humans’ capacity to learn.
“our capacity to learn is what is the underlying feature is neuroplasticity.”
Listen at 9:43
Meditation quiets left-hemisphere activity and opens access to right-hemisphere processes.
“it's billion dollar industry of meditation to quiet what's going on in the left hemisphere so that we can open up the possibility to what's going on in the right hemisphere.”
Listen at 10:28
Loving, supporting, and encouraging one another benefits humanity.
“our number one job is to love one another. When we love one another and we support one another and we encourage one another, we all grow and we will benefit as humanity.”
Listen at 14:37
Humanity should nurture Earth because humans and the planet are symbiotically related.
“we need to nurture the planet as a part of us because we have a symbiotic relationship with this planet”
Listen at 14:55
Visual fibers from each retina cross to the opposite brain hemisphere.
“And then those fibers are, boom, crossing over to the opposite hemisphere.”
Listen at 16:42
Specially positioned light can help people choose between left- and right-hemisphere states.
“this is an easy, easy way for people to control and choose how they want to be between their two hemispheres and really get to know”
Listen at 18:33
The glasses’ effects are anatomical rather than merely placebo-driven.
“This isn't about a placebo having a behavioral impact. This is the anatomy of the brain.”
Listen at 19:14
A recent Harvard study showed the glasses’ effects on fMRI.
“they just did a brand new one at Harvard and. And showed it on fmri.”
Listen at 19:23
Frederick Schiffer used hemispheric glasses with psychiatric patients to identify differing mental states.
“he would use these types of glasses with his psychiatric patients and would show the patient that there is a part of them that is less well and one side that is more ill.”
Listen at 19:59
The exercise preferentially stimulates specific brain cells.
“all you're doing right now is preferentially stimulating certain cells.”
Listen at 21:07
Practiced awareness enables rapid switching among the four characters.
“I can jump between all four in an instant because I know them so well.”
Listen at 22:14
Taking playful breaks can improve subsequent creativity and openness at work.
“And then I go back and I do such a more creative and open job because I made space instead.”
Listen at 25:22
Statements are attributed to the speaker as said on the episode and reflect their view at the time, not PodLume's. They are not advice.
