Summary
Andrew Huberman speaks with Dr. Victor Carrion, Vice-Chair of Psychiatry and Behavioral Sciences at Stanford School of Medicine, about the science and treatment of post-traumatic stress disorder in children, adolescents, and adults. Dr. Carrion explains how PTSD develops from stress and trauma, how elevated cortisol during development physically alters brain structure -- particularly reducing prefrontal cortex volume -- and why children are especially vulnerable. They discuss the significant overlap between PTSD and ADHD symptoms, including attention difficulties and emotional dysregulation, and how misdiagnosis between the two is common.
The episode centers on Dr. Carrion's cue-centered therapy (CCT), which helps individuals identify triggers, build a personal "toolbox" of coping strategies, and develop a coherent narrative around traumatic experiences. Specific tools include the 4-corner square response for mapping physical sensations, emotions, thoughts, and behaviors associated with triggers, and a "feelings thermometer" for calibrating emotional intensity. They also discuss a school-based yoga and mindfulness curriculum (Pure Power) that has shown measurable improvements in stress resilience, mood, and sleep, as well as the role of deliberate cold exposure in building agency and emotional regulation.
Key Points
- Childhood trauma physically alters brain structure by elevating cortisol, which reduces prefrontal cortex volume and impairs executive function
- PTSD and ADHD share significant symptom overlap -- attention difficulties, emotional dysregulation, and impulsivity -- leading to frequent misdiagnosis
- Cue-centered therapy (CCT) helps individuals identify trauma triggers and build personalized coping toolboxes that restore a sense of agency and control
- The 4-corner square response maps triggers across four dimensions -- physical sensations, emotions, thoughts, and behaviors -- to build awareness and interrupt automatic reactions
- Transgenerational trauma can transmit stress responses across generations through both epigenetic mechanisms and behavioral modeling
- School-based yoga and mindfulness programs (Pure Power curriculum) show measurable improvements in stress resilience, mood regulation, and sleep quality
- Deliberate cold exposure can serve as a controlled stressor that builds agency and emotional regulation capacity, relevant to PTSD recovery
Key Moments
Dr. Carrion's approach: combining mindfulness with neurobiology to treat childhood PTSD
This episode explores the differences between anxiety, stress, and trauma, and how mindfulness combined with cognitive behavioral therapy maps onto the underlying neurobiology of PTSD at different stages.
"What makes Dr. Carrion's work unique is that it combines the psychological, the neurobiological, but also practical tools such as mindfulness."
Cold exposure as a stress inoculation tool: practicing frontal control over the limbic system
The adrenaline response to cold is non-negotiable. That makes cold exposure a practice ground for frontal cortex control over limbic stress pathways — the same skill needed to recover from PTSD.
"In other words, it kind of sucks it's uncomfortable and i think one non-negotiable fact about deliberate cold exposure is that it gives people an opportunity to explore their own stress response if they're going to do it safely right you take a cold shower you have some control you can get out immediately obviously you don't want it so cold that you give yourself cardiac arrest you know you have to be careful with deliberate cold exposure, but the adrenaline response to uncomfortable cold is non-negotiable. And I believe that whether or not somebody decides to recite the alphabet or think about how cold it is or whatever it is, what they're doing is they are practicing this frontal control over the limbic pathways. It's just sort of a general exercise for controlling the limbic system through thought."
School yoga program eliminated discipline referrals and added 73 min of sleep per night
After 3 months of yoga and mindfulness in classrooms, zero students were sent to the principal's office. A larger randomized controlled trial found students gained 73 minutes of sleep and increased deep sleep.
"At the end of about three months, I get called to the principal's office. I have to go to the principal's office because the principal was interested in finding out what was going on in there because none of those kids in those classrooms had gone to her office in all that time. They hadn't gotten in trouble. They had not gotten in trouble. So I explained what it was, and we decided to do a bigger scale study."
Classroom yoga and mindfulness RCT: 73 more minutes of sleep, deeper REM, quieter amygdala
A district-wide randomized trial showed yoga and mindfulness increased total sleep by 73 minutes and deepened sleep. Preliminary brain imaging data shows decreased amygdala activity after the intervention.
"And it was not in a sleep center. It was in their own house. So collaborating with Ruth O'Hara from the department, we were able to assess their sleep. And deep sleep is very important. That's where you process the events of the day. So these kids were increasing REM, total sleep, deep sleep, doing much better. And then another thing, because of our previous studies that we've talked about in terms of brain function, this hasn't been published, but we have some preliminary data demonstrating that those kids that went through the intervention before and after the intervention were able to decrease the activity of their amygdala, which was very powerful and also very helpful. So many of these kids adapted this into their daily practices. After the study was over, we went to our control group and we taught those lessons there. And now it has served to identify even more tools that we can put in the toolbox of CCT."
Teaching teachers to lead yoga is more effective than bringing in yoga instructors
Having teachers lead the yoga and mindfulness sessions worked better than bringing in yoga instructors who couldn't control a classroom. Simple poses during math class for 10 minutes were enough to see results.
"So they stay with the same clothes, but we had mats. They had mats. Every student had a mat. And it's interesting that you mentioned PE because the first suggestion was, let's do it during PE class. And I'm like, no, that's, you know, rowing from Paul to give to Peter. Until I learned that PE, like you said, was not happening. So sad. Which I couldn't believe. And if anything, I think the study has helped for them to bring PE back. And the classes, which are these lessons and yoga movements and mindfulness, were really taking place in the classroom that whatever teacher learned it. So if it was the math teacher, she was taking 10 minutes aside to do it. If it was the PE and PE was not happening there, they may dedicate the 50 minutes to do the yoga and the mindfulness. So we have a number of assessments that we did. And like I mentioned, yes, it was acceptable and it improved mood and all of that. But I think the biggest finding that we published from that study was that it increased 73 minutes of sleep."
Scaling yoga + mindfulness across all of Puerto Rico's schools to study resilience
Puerto Rico's entire island is one school district, enabling island-wide implementation. All teachers are being trained in yoga/mindfulness and all counselors in cue center therapy for PTSD.
"So some of the cases in Puerto Rico have gone through a lot. But also, the whole island of Puerto Rico is one of the largest school districts in the U.S. The whole island is one district, meaning that if you do something like a program like the one we're talking about, you can implement it island-wide. Currently, we are launching a project in Puerto Rico where all the teachers will be trained in the yoga and mindfulness curriculum."
Brain organoids + Puerto Rico trial: bridging genetics to yoga outcomes for stress resilience
Stanford researchers are growing brain organoids, exposing them to cortisol, and mapping results back to genomic data from children in the Puerto Rico yoga/mindfulness trial to identify genes that protect against stress.
"And not only that, we can actually also look at response, treatment response for the intervention, for the yoga and mindfulness preventive intervention, and for the treatment, for the cue center therapy."
From mini-brains in a dish to school yoga: a multi-level study on stress and resilience genes
The study bridges molecular genetics to yoga interventions — growing brain organoids exposed to cortisol, analyzing genomes, and mapping those findings to thousands of Puerto Rico schoolchildren in yoga programs.
"I must say, as you described that study, I had three thoughts. One, wow, how awesome is this, that you can bridge across so many different levels of analysis. I mean, as you described that study, I had three thoughts. One, wow, how awesome is this, that you can bridge across so many different levels of analysis. I mean, because you're talking about molecular genetics all the way up to yoga in school children in Puerto Rico, and PTSD, you know, it's just a complex disorder."
