A functional neurologist evaluates and treats problems in the nervous system using non-invasive techniques like targeted eye exercises, balance training, and sensory stimulation, all aimed at coaxing the brain into rewiring itself. The field grew out of chiropractic practice and operates on the premise that many neurological complaints stem from subtle imbalances in brain function rather than visible structural damage. That premise, along with the evidence supporting it, remains a significant point of contention between functional neurology practitioners and mainstream medicine.
How Functional Neurologists Assess Patients
A visit to a functional neurologist typically begins with an unusually detailed neurological examination. Where a conventional neurologist might order an MRI or CT scan looking for structural problems like tumors or lesions, a functional neurologist focuses on how well different brain regions are performing in real time. The exam often takes considerably longer than a standard neurology appointment because the practitioner is looking for asymmetries and subtle deficits in how the brain processes information.
Eye movements receive outsized attention. A functional neurologist will track how your eyes follow a moving target, how quickly and accurately they jump between two points (called saccades), and whether they drift when they should stay still. Research in mainstream neurology supports the diagnostic value of this approach in a general sense: high-resolution video-oculography can precisely measure saccadic dynamics, offering a window into disruptions affecting neural networks, and saccadic testing shows potential as an early, sensitive biomarker for detecting subclinical disease impact across a range of neurological conditions.1PubMed Central. Saccadic eye movements in neurological disease: cognitive mechanisms and clinical applications A functional neurologist uses these observations differently from a hospital neurologist, though. Rather than diagnosing a named disease, they are mapping which circuits seem sluggish or overactive and building a treatment plan around those findings.
Balance and posture testing is another staple. Practitioners often use computerized posturography, which measures how your body sways while standing on a force plate under various conditions, sometimes with eyes open, sometimes closed, sometimes on an unstable surface. Vestibular function testing, including videonystagmography (which records involuntary eye movements triggered by the inner ear), rounds out the picture. These tools are used widely in conventional medicine too. A study of patients with peripheral vestibular disorders found that posturography and caloric vestibular tests sometimes give conflicting results: roughly half of patients showed abnormalities on both tests, while others had abnormal results on one but not the other.2Neural Plasticity. Comparative analysis of the data obtained in computerized posturography and videonystagmography for patients with peripheral vestibular deficit Functional neurologists argue this kind of layered testing helps catch problems that a single test would miss.
What Treatment Looks Like
If the assessment is about finding which brain areas are underperforming, treatment is about selectively stimulating those areas to bring them back online. Functional neurologists use an eclectic toolkit, and the specific combination varies dramatically from patient to patient. That individualized approach is a defining feature of the field, though critics point out that it also makes the treatments hard to study in controlled trials.
Common treatment methods include:
- Eye exercises: Specific patterns of saccades, smooth-pursuit tracking, or convergence drills designed to activate targeted brain circuits. A patient with dizziness might be asked to track a moving target in a particular direction thought to stimulate an underactive vestibular pathway.
- Vestibular rehabilitation: Exercises that challenge the balance system, such as head movements during walking, standing on unstable surfaces, or exposure to specific visual motion patterns. This approach has solid evidence in mainstream physical therapy: individualized vestibular rehabilitation has been shown to decrease fall risk and improve gaze stability in patients with vestibular dysfunction.3PubMed. Vestibular rehabilitation decreases fall risk and improves gaze stability for an older individual with unilateral vestibular hypofunction
- Sensory stimulation: Light touch, vibration, sound, or visual stimuli applied to specific parts of the body or visual field. The idea is to feed input into a particular sensory channel to activate the brain regions that process it.
- Joint manipulation and physical movement: Because the field emerged from chiropractic, spinal adjustments sometimes feature in treatment plans, alongside targeted physical exercises.
Sessions are often short and intense. Some functional neurologists describe a “metabolic window” during which they believe the targeted brain area is responsive before fatigue sets in, so treatments might last only minutes. Patients are frequently given home exercises to continue between visits.
The Neuroplasticity Premise
The entire approach rests on the concept of neuroplasticity, the brain’s ability to reorganize its connections in response to experience. This is not controversial in itself. Mainstream neuroscience has thoroughly documented that the brain changes structurally and functionally in response to repeated stimulation. Research has shown that neuromodulation of different components of the sensory pathway can induce brain remodeling at the synaptic, cellular, and circuit levels.4Neural Plasticity. Targeted Sensory System Neuromodulation Improves Sensorimotor and Cognitive Deficits After Brain Injury: Bridging Mechanisms to Practice And in stroke survivors, rehabilitation paired with sensory stimulation has produced measurable changes in brain connectivity that were largely maintained at follow-up.5PubMed Central. Neuroplasticity after upper-extremity rehabilitation therapy with sensory stimulation in chronic stroke survivors
Where functional neurology parts ways with the mainstream is in the specificity of its claims. Practitioners work from the idea that you can target a particular group of neurons, say in one side of the cerebellum, by choosing just the right combination of eye exercises, balance challenges, and sensory inputs. The field’s theoretical framework centers on the concept that symptoms arise from a dysfunctional “central integrative state” of specific neuronal groups. In this model, a cluster of neurons in a particular brain region becomes either overactive or underactive, disrupting communication within the central nervous system.6PubMed Central. Unravelling functional neurology: a scoping review of theories and clinical applications in a context of chiropractic manual therapy The treatment goal is to normalize that activity through precisely chosen inputs.
This is where the debate gets heated. The basic neuroscience of plasticity is well established, but the leap from “the brain can change” to “we can reliably direct those changes by stimulating one side of the cerebellum with a specific eye exercise” is enormous. Mainstream neurologists tend to view the specificity claims as running far ahead of what the evidence actually supports.
The Evidence Gap
The most persistent critique of functional neurology is that its clinical evidence base is thin. A critical review specifically examining published clinical research on functional neurology interventions found only nine relevant studies in the entire literature. The authors identified major design and methodological problems in all nine, and only four were even considered potentially appropriate for closer analysis. Those four were judged to be of low methodological quality, leading the reviewers to conclude that no robust evidence could be found for the effect or benefit of the tested functional neurology interventions.6PubMed Central. Unravelling functional neurology: a scoping review of theories and clinical applications in a context of chiropractic manual therapy
That does not mean the individual tools functional neurologists use are without support. Vestibular rehabilitation, eye-movement training, and sensory-based therapies all have varying degrees of mainstream research behind them when applied to specific, well-defined conditions. What lacks evidence is the overarching functional neurology framework: the idea that a practitioner can diagnose which brain region is dysfunctional through a clinical exam and then select a precise combination of stimuli to correct it. The gap is between the evidence for the individual pieces and the evidence for the system that assembles them.
Practitioners counter that the field is young, that its individualized approach makes randomized controlled trials difficult to design, and that patient outcomes in their clinics speak for themselves. These are fair points about the challenges of researching complex, personalized interventions, but they do not substitute for the evidence itself. A reader considering functional neurology should know that the field operates in a space where anecdotal success stories are plentiful, published case reports exist, but rigorous group-level evidence demonstrating that the approach works better than other interventions or no intervention remains largely absent.
An Important Naming Confusion
If you search for “functional neurologist,” you will quickly run into two completely different uses of the word “functional,” and the confusion matters. The functional neurology described above, sometimes called chiropractic functional neurology or the Carrick approach after its most prominent proponent, is a subspecialty within chiropractic. But in mainstream medicine, “functional” in “functional neurological disorder” (FND) refers to something else entirely: neurological symptoms like weakness, tremor, or seizures that are real and disabling but arise from abnormal nervous system functioning rather than structural disease.
FND is increasingly recognized as a common and legitimate diagnosis. In one emergency department study, functional symptoms accounted for about 3.6% of all neurological presentations. Patients had a median age of 33, roughly seven in ten were female, and functional seizures were the most common presentation, followed by motor or sensory deficits.7PubMed Central. Frequency and characteristics of functional neurological disorder in the emergency department In a large prospective cohort of patients with functional motor disorders, a similar demographic pattern emerged: predominantly women, with a median symptom onset age in the mid-thirties, and about half presenting with functional weakness and the other half with movement disorders like tremor and dystonia.8medRxiv. Demographic and clinical characteristics of patients with functional motor disorders: the prospective Salpêtrière cohort
A mainstream neurologist who specializes in treating FND is sometimes informally called a “functional neurologist,” but they practice evidence-based neurology in a hospital or clinic setting, hold an MD or DO degree, and use approaches like physiotherapy and cognitive behavioral therapy that have been evaluated in clinical trials. A systematic review of psychotherapy for FND identified 19 prospective studies meeting quality criteria, most examining cognitive behavioral therapy or psychodynamic therapy.9Journal of Neurology, Neurosurgery & Psychiatry. Systematic review of psychotherapy for adults with functional neurological disorder And a meta-analysis of rehabilitation trials for FND found that about three-quarters of participants showed clinical improvement, though the effect sizes varied considerably across studies and the evidence for improvements in physical function, fatigue, and mental health beyond symptom reduction was not statistically significant.10PubMed. Rehabilitation Therapies for Functional Neurological Disorder: A Systematic Review and Meta-Analysis of Clinical Trials
If someone recommends you see a “functional neurologist,” it is worth asking exactly what they mean. The chiropractic functional neurologist and the MD neurologist who treats functional neurological disorder are working in different paradigms with different training, different evidence bases, and different regulatory oversight.
Who Tends to Seek Out Functional Neurology
People typically find their way to a chiropractic functional neurologist after conventional medical workups have come up empty. The referral pattern is telling: these are often patients with real, bothersome symptoms like chronic dizziness, balance problems, persistent headaches after a concussion, difficulty concentrating, or movement issues, but whose MRIs and blood tests look normal. Conventional medicine sometimes struggles with these patients, not because their symptoms are imaginary but because the standard diagnostic toolkit is designed to find structural problems, and when none are found, the path forward can be unclear.
Functional neurologists have carved out a niche with conditions like post-concussion syndrome, where symptoms persist long after the initial injury has healed; chronic vestibular dysfunction, where dizziness and balance trouble linger despite normal imaging; developmental disorders in children, where parents may seek alternatives after limited progress with standard therapies; and movement disorders like dystonia, where the brain sends abnormal signals to muscles. In one case study, a pianist with focal hand dystonia underwent sensory motor retuning treatment and achieved improvement from the start of therapy, with performance returning to pre-illness levels after ten months of treatment and remaining normal through eight years of follow-up.11Medical Problems of Performing Artists. Long-Term Treatment Effects of Sensory Motor Retuning in a Pianist with Focal Dystonia
It is worth noting that sensory motor retuning is a behavioral rehabilitation approach used in mainstream settings, not exclusively a functional neurology technique. This illustrates a broader pattern: many of the success stories attributed to functional neurology involve therapies that are also used, studied, and validated in conventional rehabilitation medicine. The question is whether the functional neurology framework adds something beyond what standard neurorehabilitation already provides.
Credentials and What to Ask
In most countries, functional neurology is practiced by chiropractors who have completed additional postgraduate training, typically through fellowship programs. The most recognized credential is the Diplomate of the American Chiropractic Neurology Board (DACNB), later renamed under the American College of Functional Neurology. This involves several hundred hours of coursework and clinical work beyond chiropractic school. Some practitioners hold the Fellow of the American College of Functional Neurology (FACFN) designation, representing additional study.
These are not medical degrees, and functional neurologists are not medical doctors. They cannot prescribe medication, order certain imaging studies independently (depending on jurisdiction), or perform surgery. Their scope of practice is governed by chiropractic licensing boards, which vary by state and country. This is an important practical consideration: if your symptoms turn out to have a structural cause that requires medical intervention, a functional neurologist would need to refer you to a physician.
If you are considering seeing a functional neurologist, a few questions are worth asking up front. First, what specific training and credentials does the practitioner hold? Second, what does the proposed treatment plan involve, and what is the expected timeline for seeing results? Third, are they willing to coordinate with your primary care physician or conventional neurologist? A practitioner who resists sharing information with your medical team or who discourages you from pursuing conventional evaluation is a red flag. Fourth, and honestly, what evidence supports the specific intervention being proposed for your specific condition? A practitioner who can point to published research for the particular therapy they are recommending, even if it is a case series or small trial, is at least engaging with the question seriously.
How the Brain Combines Sensory Signals
One reason functional neurology has intuitive appeal is that the brain genuinely does integrate information from multiple sensory systems in ways that can go wrong. Your sense of balance, for example, depends on a continuous conversation between your inner ear, your eyes, and the position sensors in your joints and muscles. Research on neurons in the medial superior temporal area of the brain found that these cells combine visual and vestibular signals to enhance the detection of self-movement, with about half of recorded neurons responding strongly to visual motion simulating self-movement and about a quarter responding to actual physical movement.12PubMed. MST neurons respond to optic flow and translational movement When these systems stop agreeing with each other, because of inner ear damage, a concussion, or prolonged illness, the resulting sensory mismatch can produce dizziness, nausea, and disorientation that feel terrible but show nothing on a scan.
This is the kind of problem where functional neurology’s approach makes the most conceptual sense. If the issue is a mismatch in how the brain processes sensory information, then exercises that retrain those processing pathways are a logical intervention. Vestibular rehabilitation, which is well-supported in mainstream evidence, works on exactly this principle. The open question is whether the additional diagnostic and therapeutic specificity that functional neurology claims to offer, the precise mapping of which brain regions are over- or underactive, actually improves outcomes compared to standard vestibular and balance rehabilitation.
Timing and Chronicity in Neurological Rehabilitation
One factor that matters regardless of which type of practitioner you see is how long symptoms have been present before treatment begins. In functional neurological disorder, a systematic review and meta-analysis found that longer symptom duration modestly reduced improvements in motor symptoms and physical quality of life, with motor symptom gains decreasing by roughly three points per year of delay on a hundred-point scale. Mental health gains, however, appeared to hold regardless of how long symptoms had been present.13PubMed Central. Treatment outcomes in functional neurological disorder: a systematic review and meta-analysis exploring the influence of symptom chronicity
This pattern likely applies broadly to neurological rehabilitation of all kinds. The brain’s ability to reorganize around a problem does not have a hard expiration date, but earlier intervention generally produces better physical outcomes. If you are dealing with lingering neurological symptoms and are considering functional neurology or any other rehabilitation approach, the evidence suggests that waiting and hoping is less effective than actively pursuing treatment, even if the optimal treatment choice is still being debated. The caveat, which applies to every option discussed in this article, is that a thorough conventional medical evaluation should come first. Subtle structural problems, autoimmune conditions, and metabolic disorders can all mimic the kinds of symptoms functional neurologists treat, and missing those diagnoses while pursuing rehabilitation could mean losing valuable time.