“When you stimulate the healthier side of the brain, you’re not imagining a better version of yourself—you’re accessing the part of you that’s always been capable, confident, and whole.”
— Dr. Fredric Schiffer
Depression is often described as a chemical imbalance, but what if that explanation barely scratches the surface? What if the emotional pain so many people experience is not a malfunction, but a message—a sign of unresolved trauma stored deep within the brain? In this groundbreaking conversation, Harvard psychiatrist and McLean Hospital researcher Dr. Fredric Schiffer challenges the traditional view of mental health and introduces a revolutionary perspective: we are not governed by a single mind, but by two. Through decades of clinical work, research, and innovative brain-based techniques, Dr. Schiffer has discovered that each hemisphere of the brain holds its own emotional reality—and for many people, one side carries the burden of childhood wounds while the other holds the key to healing.
In this deeply insightful interview, Dr. Schiffer and Stacey Chillemi explore the hidden roots of depression, the surprising ways trauma shapes our daily lives, and the transformative power of Dual Brain Psychology. Together, they walk through real-time demonstrations of how simple visual techniques can activate either the wounded “child side” of the brain or the strong, grounded “adult side”—shifts that many people feel instantly. Whether you’re navigating anxiety, addiction, self-doubt, or simply trying to understand your emotional patterns more clearly, this interview offers a new lens through which to view yourself, your past, and the path to emotional freedom.
Thank you so much for joining us, Dr. Fred! Our readers would love to get to know you a bit better. Can you tell us a bit about your backstory?
I’m delighted to be here, Stacey. My career has been built around trying to understand why people suffer—and why traditional explanations often fall short. As a psychiatrist affiliated with Harvard Medical School and McLean Hospital, I’ve worked with individuals struggling with depression, anxiety, PTSD, and addiction. Over time, I began noticing that many of my patients didn’t present as just one unified self. Instead, they seemed to shift between two very distinct internal states: one capable and grounded, the other fearful and overwhelmed.
Those observations led me to revisit the famous split-brain research, where the left and right hemispheres operated as two separate minds. I eventually collaborated with experts studying these patients and realized something profound—many people without brain surgery still behave as though they have “two minds.” That discovery sparked decades of research, the development of Dual Brain Psychology, and most recently, a large NIH-funded study exploring how stimulating the healthier hemisphere may help people recovering from fentanyl addiction. It’s been a long journey, but the goal has always been the same: helping people access the part of themselves that is whole, wise, and capable of healing.
Most people still think of depression as a “chemical imbalance.” From your perspective, how is that view incomplete?
The chemical imbalance theory is familiar, but it misses something crucial. Yes, brain chemistry changes in depression—but the question is why. My view is that experience comes first. Painful, overwhelming, or shaming experiences—especially in childhood—reshape how the brain connects and communicates. The chemistry follows the experience, not the other way around.
If someone repeatedly hears they’re not good enough, or endures trauma or neglect, the brain learns that story. It reorganizes around it. So depression isn’t just a set of chemicals gone wrong—it’s an emotional reality shaped by lived experience, reinforced over years, and etched into the brain’s circuitry.
How do you define depression differently from the traditional psychiatric model?
I prefer to think about depression as a state of painful hopelessness rather than a checklist of symptoms. When someone feels like a failure, believes they have no future, or can’t see a way out of their suffering, that’s depression.
Imagine hearing “you’re worthless” again and again—whether from others or from your own internal dialogue. It erodes your ability to function, makes everyday tasks feel impossible, and eventually, the resulting struggles seem to “prove” that the negative beliefs were right. That’s the loop: painful experience changes the brain, and the brain then recreates the same painful beliefs in daily life.
Why do painful memories tend to stick more than positive ones?
It comes down to salience, meaning how important or threatening something feels. Traumas are highly salient because they threaten our sense of safety or worth, so the brain labels them as “never forget this.” It’s a protective mechanism.
Positive experiences usually don’t carry the same life-or-death weight, so they fade more easily. That’s why many people can recall childhood humiliation in vivid detail but can barely remember last week’s compliment. The brain prioritizes survival over happiness.
Why is understanding childhood so crucial when treating depression and anxiety?
Childhood is where we first learn who we are and what the world expects from us. If a child is shamed, belittled, ignored, or frightened, that becomes the emotional blueprint for adulthood. Even if someone doesn’t consciously think about their trauma, they live as if those old experiences are still happening.
So when adults struggle—losing jobs, withdrawing socially, falling into addiction—it often reinforces childhood messages of inadequacy. Anxiety becomes the fear that the trauma will repeat. Depression becomes the belief that the trauma has already defined them. That’s why exploring childhood isn’t about blame—it’s about understanding the origin of a lifelong emotional script.
How does trauma lead to behaviors like addiction or compulsive habits?
Behaviors like drinking, smoking, gambling, overeating—these are often attempts to escape emotional pain, even if just for a moment. If your inner world constantly tells you you’re not enough, the discomfort becomes unbearable.
Addictions offer relief, pleasure, or distraction, even when they cause long-term harm. From the inside, people turn to these behaviors because they can’t tolerate the emotional state they’re in. Unfortunately, the consequences often reinforce the very beliefs they were trying to escape, deepening the cycle.
For readers unfamiliar with it, what is Dual Brain Psychology?
Dual Brain Psychology proposes that each hemisphere—the left and right—is its own mind, with its own emotional tone and interpretation of the world. In many people, one side is mature, confident, and emotionally regulated—the “adult.” The other side is more fearful, shame-filled, and traumatized—the “inner child.”
Crucially, trauma tends to be stored more heavily in one hemisphere. We can stimulate these sides through visual techniques or specialized light stimulation, and when we do, people often feel drastically different depending on which side is activated.
The therapeutic goal is to strengthen the adult side and help it compassionately lead and comfort the traumatized side.
During our exercise, I felt drastically different depending on which side I looked through. What was happening there?
You were experiencing the lateral visual field technique, which allows us to selectively activate one hemisphere. By covering one eye and half of the other, you looked only through the outer part of your visual field. Due to how visual pathways are wired, this stimulates the opposite hemisphere much more strongly.
When you looked through one side, you felt depressed, nauseous, hopeless. When you looked through the other, you felt calm, joyful, confident. That contrast wasn’t imagined—it reflected two distinct emotional systems in your brain. Experiencing this difference firsthand often gives people hope, because they realize the healthy, grounded version of themselves isn’t gone—it’s simply been overshadowed by the traumatized hemisphere.
You helped me understand that my “inner little girl” used to run my life. How does this metaphor help people heal?
It’s a powerful way of understanding what’s happening internally. The traumatized inner child often tries to “drive the van”—making decisions, reacting impulsively, interpreting situations through fear. She’s doing her best, but she doesn’t have the skills or perspective to navigate adult life.
Healing comes from letting the adult side take the wheel—calm, loving, firm, and capable—while the child sits safely in the back, comforted and protected. Using the visual techniques, we can have conversations with both minds, helping the child express her pain and teaching the adult to comfort, reassure, and lead. Eventually, the child learns she can trust the adult, and the adult becomes the stable guide the person relies on.
When someone is stuck in depression, what is their inner child trying to protect them from?
The inner child is usually trying to prevent a repeat of the original trauma—rejection, humiliation, abandonment, failure. She’s terrified, and she believes that if she lets her guard down, she’ll be hurt again. So she may push people away, sabotage opportunities, or cling to familiar but unhealthy situations.
Her intentions are protective, but her methods often create more pain. The therapeutic work is helping her see that the world is no longer the dangerous place she remembers—and helping the adult part guide her gently toward safety and trust.
Is healing through this process typically linear?
Not usually. Most people experience steady progress with occasional dips. Early sessions can bring significant relief, because understanding the two sides of the mind is incredibly clarifying. The inner child may try to take over again when triggered, but with practice, people learn to recognize what’s happening and bring the adult side forward.
Some improve quickly; others with more severe trauma take longer. What matters most is consistency—continuing the dialogue between the adult and child sides until the adult becomes the default leader.
Does the brain actually rewire through this work?
We can’t watch every synapse change in real time, but all evidence points to yes. Trauma clearly changes the brain, and healing—through new experiences of safety, worth, and perspective—reshapes those pathways.
In one of our studies, using fMRI, we saw brain activity shift dramatically when people looked through one lateral field versus the other. That tells us the technique has real neurological impact, and over time, these repeated experiences likely build new neural patterns.
What role do compassion or forgiveness play in this process?
Understanding is key. People need to understand that they were mistreated, lied to, or emotionally abandoned—and that those experiences shaped their inner child. Facing that truth takes strength.
Forgiveness is a complicated concept. I focus less on “you must forgive” and more on helping people carry the truth without being consumed by rage or shame. Anger can become a healthy army—protective, assertive, constructive—rather than a chaotic force. Healing requires clarity, compassion for oneself, and channeling anger into building a better life.
You’ve said trauma can distort how people read messages or interactions. How does that show up in everyday life?
If someone has a lot of unresolved trauma, their inner child reads the world as dangerous. A neutral message—“We need to talk”—may be interpreted as rejection or anger. Someone else might read the same words as a simple scheduling note.
Recognizing the role of the two hemispheres helps people pause and say, “Is this my adult reading this message—or my wounded child?” That pause alone can change everything, making communication smoother and life far less reactive.
How did you first discover that visual stimulation could activate different emotional states?
It started with curiosity. I noticed patients often switched between two emotional states, which reminded me of split-brain research. When I learned about a German study that used a machine to show movies to one lateral visual field, I realized I could replicate the method simply by using hands or a card.
One of my first patients to try it was a Vietnam veteran. When he looked through one side, he suddenly felt like he was back in the jungle; when he looked through the other, he said calmly, “No, it’s just a plant.” That moment changed everything.
Tell us about the NIH study using light to stimulate the brain.
We use a specialized light placed over the forehead to stimulate the healthier hemisphere. Light is energy—it penetrates safely and activates the brain directly. Many patients in our fentanyl study appear to respond remarkably well to this treatment, although we’re awaiting official results.
We’ve also developed glasses that do the same thing as the hand or card, but more practically. You can flip them to stimulate either side and carry on a conversation with the child and adult minds in real time.
Can anyone try your techniques at home?
Many people safely use the visual technique at home. They block half of each eye and notice which side feels more positive or more distressed. Over time, they learn to comfort their inner child and strengthen their adult side.
About 15% of people don’t respond strongly to the visual method, but many of those respond to the light technique. And even for those who do respond, it’s powerful work—so having guidance or support can be very helpful.
Who do you believe can benefit most from Dual Brain Psychology?
Anyone who wants to understand themselves better. Certainly those with trauma, depression, addiction, or anxiety benefit deeply. But even people with mild stress or mood fluctuations can grow from it.
The real gift is learning to ask: “Which side of me is speaking right now?” That question alone can change the course of someone’s day—and their life.
How can our readers further follow your work online?
The best place to find me is dualbrainpsychology.com. There, readers can explore my research, learn more about the techniques, follow updates on new studies, and order my book, Dual Brain Psychology. It explains the entire approach in detail and teaches readers how to begin working with their two minds.
Fred, thank you for such an enlightening and hopeful conversation. I’m grateful for the clarity you bring to such a complex topic, and for the tools you’ve shared that truly help people heal.
Thank you, Stacey. I really enjoyed our conversation. Your thoughtful questions made this a pleasure, and I appreciate the chance to share this work with your audience. I look forward to speaking again soon.
