Understanding Brain Development Through the Lens of Functional Neurology

Understanding Brain Development Through the Lens of Functional Neurology

ByDr. Sam McDonald
One of the biggest misconceptions about childhood development is that it happens automatically. A child gets older. The brain matures. Skills improve. Everything falls into place. While development certainly follows a natural progression, the reality is much more complex. The developing brain is constantly responding to experience. Every movement, sensory input, social interaction, challenge, and learning opportunity helps shape neurological growth. This is one reason two children of the same age can look remarkably different in terms of attention, coordination, emotional regulation, sensory processing, and learning. For families exploring pediatric functional neurology in Denver, understanding how the brain develops can provide valuable insight into why some children thrive in certain areas while struggling in others.

Brain Development Is Not a Straight Line

Parents often think of development as a checklist. Roll over. Crawl. Walk. Talk. Read. While milestones are important, brain development is not simply a series of boxes to check. Different neurological systems develop at different rates. Some children develop strong language skills early. Others excel physically. Some demonstrate advanced reasoning abilities but struggle with social interaction or emotional regulation. Development is dynamic, and every child follows a unique path. What matters is not whether every child develops identically, but whether the brain systems responsible for learning, movement, attention, and regulation are progressing in a healthy and coordinated way.

The Brain Develops From the Bottom Up

One of the central concepts in functional neurology is that development follows a bottom-up process. In simple terms, the brain develops from more basic systems toward more complex ones. Before a child can sit still and focus in a classroom, the nervous system must first establish efficient sensory processing, balance, coordination, posture, and body awareness. Before executive functioning develops, foundational systems need to be functioning appropriately. When these lower-level systems are not fully integrated, they can interfere with higher-level skills. This concept is sometimes referred to as bottom-up interference. The challenge may appear to involve attention, behavior, or learning, but the contributing factors may originate much earlier in the developmental process.

Movement Is One of the Brain’s Most Important Teachers

Many parents are surprised to learn how closely movement and brain development are connected. The developing brain depends heavily on information coming from muscles, joints, balance systems, and body position receptors. This information helps build and strengthen neural networks responsible for:
  • Attention
  • Coordination
  • Balance
  • Sensory processing
  • Emotional regulation
  • Learning
  • Executive functioning
From a functional neurology perspective, movement is not simply exercise. It is one of the primary ways the brain learns about the world. This is why developmental milestones such as rolling, crawling, balancing, climbing, and coordinated movement are so important. They provide neurological input that helps organize the developing nervous system.

Why Primitive Reflexes Matter

One of the most important concepts in the Melillo framework involves primitive reflexes. Primitive reflexes are automatic movement patterns present during infancy. They serve an important purpose during early development, helping babies interact with their environment and begin building neurological pathways. As the brain matures, these reflexes are expected to integrate. When they remain active beyond infancy, they can interfere with:
  • Balance
  • Coordination
  • Posture
  • Eye movements
  • Sensory processing
  • Motor development
  • Attention
Because of this, retained primitive reflexes often provide important clues about neurological maturity. They do not explain every developmental challenge, but they can help clinicians better understand how the nervous system has developed over time.

Sensory Experiences Shape Brain Development

The brain develops through experience. Every sound, touch, movement, visual experience, and social interaction provides information that helps shape neurological networks. This process is known as sensory integration. Ideally, the brain learns to organize and interpret incoming sensory information efficiently. Some children process sensory information differently. They may become overwhelmed by sounds, clothing textures, food textures, or busy environments. Others seek sensory input constantly through movement, touch, or physical activity. From a functional neurology perspective, these patterns provide valuable information about how the brain is processing and integrating information from the environment.

Understanding Hemispheric Development

Another concept frequently discussed within the developmental framework described by Dr. Robert Melillo involves hemispheric development. The brain’s left and right hemispheres contribute to different aspects of neurological function. Healthy development depends on both hemispheres communicating efficiently and working together. According to the Functional Disconnection Syndrome model, some developmental challenges may involve one hemisphere developing more slowly or functioning less efficiently than the other. When this occurs, children may demonstrate uneven skill development. Parents often describe these children as exceptionally capable in some areas while struggling significantly in others. This unevenness is one reason functional neurology places such an emphasis on understanding the individual neurological profile of each child.

Why Children Rarely Struggle in Just One Area

Parents often arrive seeking help for a single concern. Attention. Reading. Behavior. Coordination. Sensory processing. What they often discover is that several systems are connected. A child with coordination challenges may also struggle with attention. A child with sensory sensitivities may experience emotional regulation difficulties. A child with learning challenges may also demonstrate balance deficits or retained primitive reflexes. This overlap occurs because the nervous system functions as an integrated network rather than a collection of separate parts. Looking at the whole picture often provides more useful information than focusing on one symptom at a time.

What Does the Research Say?

Modern neuroscience continues to support the principle of neuroplasticity. Neuroplasticity refers to the brain’s ability to adapt and reorganize in response to experience and stimulation. Researchers continue exploring how sensory-motor interventions influence neurological development and function. In a 2023 study, Teicher and colleagues observed measurable behavioral and neurological changes in children with ADHD following participation in a multimodal intervention program. While additional research is needed and these findings should not be interpreted as validation of any single therapeutic model, they support the broader concept that the developing brain remains responsive to targeted experiences and stimulation. For families, this is encouraging. Development is not static. The brain continues learning and adapting throughout childhood.

What This Approach Does and Does Not Claim

Functional neurology does not claim to cure autism, ADHD, learning disabilities, sensory processing disorder, developmental delays, or genetic conditions. Children are not broken. The goal is not to fix a child. The goal is to better understand how the nervous system functions and identify opportunities to support healthy neurological development. Every child develops differently, and every child deserves an individualized approach.

Helping Parents Understand the Bigger Picture

For families exploring pediatric functional neurology in Denver, understanding brain development often changes the conversation. Instead of asking, “What’s wrong with my child?” parents begin asking: “How is my child’s brain developing, and what might be contributing to the challenges we’re seeing?” That shift may seem small, but it can be incredibly powerful. At Omega Functional Health, we believe parents deserve thoughtful explanations that help connect the dots between movement, sensory processing, attention, learning, emotional regulation, and overall neurological development. Families throughout Denver, Wheat Ridge, Arvada, Lakewood, and surrounding communities often tell us that understanding the bigger picture is one of the most valuable parts of the process. If you’d like to learn whether a pediatric functional neurology evaluation may be appropriate for your child, we invite you to schedule a complimentary virtual consultation with our team.

References

Melillo R. Disconnected Kids. 3rd ed. TarcherPerigee; 2024. Teicher MH, Bolger E, Hafezi P, et al. Open assessment of the therapeutic and rate-dependent effects of brain balance center and interactive metronome exercises on children with attention deficit hyperactivity disorder. Psychiatry Research. 2023;319:114973. doi:10.1016/j.psychres.2022.114973.  

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