The Boy Who Was Raised as a Dog: And Other Stories from a Child Psychiatrist's Notebook

The brain stem is the most primitive and foundational part of the human brain that controls essential life functions. Perry describes the brain stem as the lowest and most central region of the brain, which develops first during childhood and is responsible for regulating core bodily processes such as heart rate, breathing, blood pressure, and body temperature. This region represents the most basic level of brain organization that humans share with even simple creatures like lizards. In Perry’s hierarchical model of brain development, the brain stem serves as the foundation upon which more complex brain regions are built, and dysfunction in this area can affect a child’s most fundamental regulatory systems.

Cortisol is a stress hormone that plays a critical role in the body’s response to fear and trauma. Perry explains that cortisol is released along with other neurochemicals like adrenaline and noradrenaline when the brain’s fear centers are activated by threatening situations. This hormone helps coordinate the body’s fight-or-flight response during acute stress, but chronic elevation of cortisol levels can have damaging effects on developing brains. Perry emphasizes that children who live in constant states of fear, such as those in the Branch Davidian compound, experience persistently high cortisol levels that can alter brain development and create lasting changes in how they respond to stress throughout their lives.

Dissociation is a primitive neurobiological response to overwhelming trauma when fighting or fleeing is impossible. During dissociation, the brain prepares the body for injury by redirecting blood flow away from the limbs and slowing the heart rate to reduce potential blood loss from wounds. The brain releases a flood of endogenous opioids, which are natural heroin-like substances that kill pain, produce calm, and create psychological distance from what is happening. This response occurs on a continuum, ranging from ordinary states like daydreaming to extreme experiences where the brain becomes completely disconnected from reality, with individuals reporting feeling emotionless and numb as though watching events happen to someone else.

Perry describes “holding” therapy as a dangerous and abusive practice—a supposed treatment for traumatized, adopted, or foster children that was intended to create parental bonds but actually caused further trauma. During “holding” therapy sessions, adults would tightly restrain children in their arms for hours, forcing them to make eye contact with caregivers while being verbally and physically assaulted until they produced convincing stories of early abuse. The practice involved multiple adults holding down the child’s limbs while digging their knuckles into the child’s ribcage with enough force to cause bruising, often preceded by exhausting activities like forcing children to run up and down stairs until they cried. Sessions would continue for hours without breaks for food or bathroom use, with adults verbally taunting the child to provoke rage, and would only end when the child displayed complete submission, declared love for their tormentors, and addressed foster or adoptive parents as their real parents. Perry explains that this coercive approach fundamentally misunderstands trauma recovery, as it re-traumatizes children by putting them back into situations where they have no control, creating trauma bonds similar to Stockholm Syndrome rather than genuine affection. The technique was used extensively in the Gilmer, Texas, case to coerce children into fabricating stories about Satanic Ritual Abuse, demonstrating how supposed therapeutic interventions can become tools of abuse themselves.

Hyperarousal is one of two major trauma responses in which the brain prepares the body for fight or flight through increased heart rate, muscle tension, and heightened alertness to potential threats. This response involves shutting down irrelevant cognitive functions in the frontal cortex while activating the limbic system’s threat-detection capabilities, making the person highly vigilant and reactive to environmental cues. When sustained over time, hyperarousal can lead to chronic anxiety, attention problems, and aggressive behavior as the individual remains in a constant state of readiness for danger. In educational settings, hyperaroused children often appear hyperactive or inattentive because they focus on scanning for threats rather than academic material, leading to frequent misdiagnosis as ADHD or oppositional defiant disorder.

The limbic system is the middle region of the brain that handles emotional responses and social behaviors essential for human relationships. Perry explains that the limbic system is completely internal and cannot be seen from the outside of the brain, yet it plays a crucial role in processing emotions like fear, love, hatred, and joy that guide human behavior. This brain region is more complex than the brain stem and represents an evolutionary development that humans share with other mammals like cats and dogs. In traumatized children like Tina, dysfunction in the limbic system can lead to problems with emotional regulation, social relationships, and the ability to form healthy attachments with caregivers and peers.

The Neurosequential Model of Therapeutics (NMT) is a clinical problem-solving approach developed by Bruce D. Perry that is outlined in The Boy Who Was Raised as a Dog. This therapeutic model focuses on understanding how trauma affects brain development and uses this knowledge to guide treatment interventions in a sequential manner that aligns with the brain’s developmental patterns. The NMT approach recognizes that different parts of the brain develop at different times and that effective therapy must address these areas in the proper developmental sequence. Following the book’s publication, the model experienced explosive growth, expanding from use by only Perry’s colleagues at the ChildTrauma Academy to adoption by over 10,000 clinicians worldwide, directly affecting more than 200,000 clients and exposing an estimated one million individuals to aspects of this therapeutic approach.

The outer cortex is the most sophisticated part of the human brain responsible for complex thinking, language, and conscious decision-making. Perry describes the outer cortex as the “crowning achievement” of the brain. It regulates uniquely human functions such as speech, abstract thinking, planning, and deliberate problem-solving. This region represents the highest level of brain organization that humans share primarily with other primates, with the frontal cortex being the most distinctly human area. When children experience trauma, damage to the outer cortex can result in problems with language development, academic learning, and the ability to think through consequences before acting, as seen in many of Perry’s young patients.

PTSD (Post-Traumatic Stress Disorder) is a condition that Perry came to recognize as a more accurate diagnosis for many traumatized children than traditional labels like ADD or behavioral disorders. Perry explains that PTSD results from the brain’s stress response systems becoming persistently activated following traumatic experiences, leading to symptoms like hypervigilance, sleep problems, and difficulty concentrating. In Tina’s case, Perry observed that her elevated heart rate and behavioral symptoms were better understood as manifestations of PTSD rather than separate psychiatric conditions. This diagnosis acknowledges that a child’s problematic behaviors often represent adaptive responses to trauma rather than inherent deficits, requiring treatment approaches that address the underlying traumatic experiences rather than simply managing surface symptoms.

Sensitization is a neurobiological process in which repeated exposure to stress or trauma leads to increased sensitivity and reactivity to future similar experiences. This pattern occurs when stressors are unpredictable, chaotic, or overwhelming, causing the brain’s stress response systems to become overactive and hypersensitive to even minor triggers. Sensitized individuals may experience intense reactions to stimuli that would not affect others, as their neural pathways have been altered to respond as though facing severe threat even in relatively safe situations. This concept helps explain why traumatized children like those in Perry’s residential treatment center often display extreme behavioral responses to seemingly minor environmental changes or social interactions.