Most Replayed Moment: The 4 Personalities Living In Your Brain! How To Switch Between Them
Dr. Jill Bolte Taylor, a Harvard-trained neuroscientist, explains the four "personalities" within the brain, detailing how left and right hemispheres influence emotion, thought, and reactivity. Understanding these parts can help achieve greater calm, focus, and control.
Deep Dive Analysis
9 Topic Outline
Introduction to Brain Anatomy and Hemispheres
The Two Emotional Systems in the Brain
The Two Thinking Systems and Human Distinction
Defining the Four Brain Personalities (Characters 1-4)
Neuroplasticity and Brain Rebuilding
The Right Brain's Capacity for Peace
The Incredible Odds of Human Existence
Demonstration of Hemispheric Stimulation with Light
Controlling Brain Personalities for Effectiveness
6 Key Concepts
Amygdala
A group of cells in each brain hemisphere that constantly scans the environment for safety, acting as a threat detection system that triggers a startle response if danger is perceived.
Hippocampus
Brain structures, one in each hemisphere, crucial for learning and memory. They function optimally and allow for new learning when the amygdala is calm and a person feels safe.
Insular Cortex
A group of cells within the limbic system of the left hemisphere that is identified as the location where craving, particularly related to addiction, resides.
Neuroplasticity
The brain's inherent capacity for cells (neurons) to constantly reach out, make new connections, and learn. This process allows the brain to rebuild skill sets and adapt based on experiences.
Purkinje Cell
A specialized, two-dimensional cell found in the cerebellum. Its unique alignment and the way fibers run through it are part of the mechanism that provides fluidity of movement.
Cerebral Cortex
The complex, outer layer of cells in the human brain, primarily made up of six layers. This portion of the organ is responsible for higher executive functioning and distinguishes humans from other animals.
5 Questions Answered
The four personalities are Left Thinking (Character 1, focused on facts, logic, and societal rules), Left Emotion (Character 2, stores past pain and drives emotional reactivity), Right Emotion (Character 3, focused on present moment sensory experience and playfulness), and Right Thinking (Character 4, the wisdom gained from experience and connection to a sense of peace).
Trauma is primarily stored in the left hemisphere's emotional system, while craving associated with addiction resides in the insular cortex, which is part of the left hemisphere's limbic system.
By recognizing the distinct functions of the left (linear, past/future, individual) and right (here and now, big picture, peace) hemispheres, one can consciously choose to stimulate or engage different parts of the brain to achieve desired states like focus or calm.
Light coming in from the lateral (outside) portion of the visual field hits the medial (inside) side of the retina and crosses to the opposite hemisphere. Manipulating this light input can preferentially stimulate either the left hemisphere (for focus) or the right hemisphere (for relaxation).
No, the effect is based on the brain's anatomical wiring, where specific light input pathways are known to stimulate particular hemispheres, as shown in fMRI studies and clinical practice by psychiatrists like Frederick Schiffer.
7 Actionable Insights
1. Understand Brain’s Four Characters
Recognize and name the four distinct ‘personalities’ within your brain (Left Thinking, Left Emotion, Right Emotion, Right Thinking) to better understand your internal states and reactions, and to consciously choose how you want to be.
2. Engage in Playful Activities
Actively seek out and engage in activities that bring you joy and ‘glee’ (Character 3) to refresh your spirit, reduce stress, and foster creativity, even for short moments like drawing hopscotch.
3. Work With Past Pain
Appreciate and be kind to your left emotional system (Character 2), which stores past pain and runs in the background to protect you, rather than trying to fix or get rid of it.
4. Stimulate Right Hemisphere for Calm
To induce a state of relaxation and calm, reduce lateral light input to your left eye (e.g., by blocking the outer visual field of that eye), which preferentially stimulates the right hemisphere.
5. Stimulate Left Hemisphere for Focus
To enhance focus and analytical thinking, reduce lateral light input to your right eye (e.g., by blocking the outer visual field of that eye), which preferentially stimulates the left hemisphere.
6. Practice Brain Character Switching
Consciously observe and identify which of your four brain characters is active in any given moment, then practice intentionally shifting between them to be more effective and balanced in different situations.
7. Cultivate Gratitude for Existence
Connect with the profound sense of gratitude for the improbable odds of your own existence to foster peace and appreciate the precious gift of life, recognizing your inherent perfection and wholeness.
5 Key Quotes
Every ability you have is because we have these brain cells that perform that function.
Dr. Jill Bolte Taylor
We are feeling creatures as biological creatures who think.
Dr. Jill Bolte Taylor
Our capacity to learn is what is the underlying feature is neuroplasticity.
Dr. Jill Bolte Taylor
We are wired at the core of our being of our right thinking tissue to feel peace.
Dr. Jill Bolte Taylor
Our number one job is to love one another.
Dr. Jill Bolte Taylor
2 Protocols
Practice Switching Between Brain Characters
Dr. Jill Bolte Taylor- Recognize in the moment if you are using your left thinking judgment (e.g., 'this makes sense' vs. 'this is crap').
- Observe yourself to identify when you are acting as Character 1 (left thinking: work, organizing, making to-do lists, controlling).
- Observe yourself to identify when you are acting as Character 2 (left emotion: unhappy, holding grudges, emotional reactivity).
- Observe yourself to identify when you are acting as Character 3 (right emotion: playful, joyful, experiencing the present moment).
- Observe yourself to identify when you are acting as Character 4 (right thinking: wisdom, gratitude, connection to the big picture and peace).
- Intentionally engage in activities that bring joy (Character 3) to refresh your spirit and refuel, allowing for more creative and open work.
Hemispheric Stimulation for Mood Control
Dr. Jill Bolte Taylor- To stimulate the left hemisphere for focus: Block the lateral (outside) visual field of the right eye, allowing light to hit the medial retina and cross to the left hemisphere.
- To stimulate the right hemisphere for relaxation: Block the lateral (outside) visual field of the left eye, allowing light to hit the medial retina and cross to the right hemisphere.
- Allow approximately 20-30 seconds for the effects to equilibrate after switching between stimulations.