Psychogenic Movement Disorders Research Articles

Neurological Disease Masquerading as Psychogenic Movement Disorders

Psychogenic movement disorders create dilemma to neurologist as well as psychiatrist in diagnosis and management. Here we highlight two cases of movement disorders of what appeared to be psychogenic movement disorder which later turned out to be Wilson’s disease (WD). Therefore, an early and accurate diagnosis, coupled with prompt and appropriate treatment, holds immense value for the overall prognosis of the patient. Keywords: Wilson’s disease, Psychogenic movement disorder, Dissociative motor disorders

An Individualized Yoga Intervention for People with Functional Neurological Disorder: Case Series.

Functional neurological disorder (FND) is a heterogeneous condition of neurological symptoms that cannot be linked to a specific neurological cause. Yoga combines movement, breathing, and meditation and has established mind-body effects for people who are managing both psychological and neurological conditions. This case series describes key components of a yoga program for people with FND, evaluating feasibility, acceptability, and efficacy via self-report surveys, clinical assessments, and postintervention interview. Four individuals with FND participated in 45-minute, one-to-one virtual yoga sessions, two times a week for 8 weeks. We measured outcomes in four domains (healthcare utilization, FND symptoms, quality of life and self-efficacy, and function and mobility) at baseline, week 4, and week 8. Assessments included the Psychogenic Movement Disorders Rating Scale, timed up-and-go test, Patient Health Questionnaire-15, Brief Illness Perceptions Questionnaire, 36-Item Short Form Health Survey, and University of Washington Self-Efficacy Scale. Four participants completed at least 8 sessions, and two completed the full intervention (16 sessions). There were no adverse events. Two participants reported positive changes after yoga and improved on all clinical assessments (timed up-and-go test and Psychogenic Movement Disorders Rating Scale). Postintervention interview analysis revealed three themes: negative diagnosis experience, perceived health effects of yoga, and session format preferences. This was an exploratory case series describing a yoga intervention that was associated with some benefits for people with FND (decreased FND symptom severity and increased function, perceived health, quality of life, and self-efficacy). A larger case series is warranted to understand how to best select individuals who would benefit from the program.

Efficacy of Hypnosis and Catalepsy Induction in Functional Neurological Disorders.

Patients with Functional Neurological Disorder (FND) experience complex patterns of motor and/or sensory symptoms. Treatment studies of psychological interventions are promising but limited. The aim of the current pilot study is to investigate the effect of treatment consisting of a combination of hypnosis and catalepsy induction on FND symptom severity. A within-subject waiting list-control design was used with 46 patients diagnosed with FND. The treatment consisted of 10 sessions. The primary outcome measure was FND symptom severity (The Psychogenic Movement Disorder Rating Scale; PMDRS). The secondary outcome measures were psychological distress and quality of life. The repeated measures (RM) ANOVA for the PMDRS as outcome measure revealed a significant effect for time with a large effect size (η2 = 0.679). Pairwise comparisons indicated that the effect of time in the treatment period was significant for the measure of FND symptom severity, whereas the waiting list period was not. The effect remained stable even at 8 weeks post treatment. As for the additional measurement, general psychological distress and quality of life, no statistically significant differences between individual time points were found. This pilot study showed that eight sessions of treatment consisting of a combination of hypnosis and catalepsy induction was effective in reducing FND symptom severity. Some explanations and limitations are provided in the paper as well as several avenues of future research.

Functional Movement Disorder; Importance of Proper Diagnosis and Treatment: A Case Report

Background: Dystonia is a common movement disorder with a wide range of aetiologies. Delays in the identification and initiation of effective treatments should be minimized to improve patient pain and optimize outcomes. This case report aims to underscore the successful treatment of chronic dystonia with the use of mood-modifying serotonin and norepinephrine reuptake inhibitors (SNRI), and encourage clinicians to consider a diagnosis of functional (psychogenic) movement disorder in patients with dystonia that is refractory to usual treatment.
 Case Report: This case report describes a 40-year-old woman who presented to a chronic pain clinic for pain related to cervical dystonia with associated head tremor. Her symptoms were refractory to nearly a decade of quarterly botulinum toxin injections. Based on careful evaluation of the patient’s history, a normal neurological examination, increased Generalized Anxiety Disorder Scale (GAD-7), Patient Health Questionnaire-9 (PHQ-9), and Injustice Experiences Questionnaire (IEQ) scores, and unsuccessful symptom management with botulinum toxin A, a diagnosis of functional movement disorder (FMD) was made. Low-dose Cymbalta was initiated. The patient achieved near complete symptom remission and resolution of her chronic pain within 2 months and achieved near complete resolution in 2 years.
 Conclusion: A diagnosis of FMD should be considered in all patients with dystonia, but especially in patients who respond inadequately to botulinum toxin injections or other rehabilitation therapies. The treatment of comorbid psychiatric conditions can result in substantial benefits and remission from dystonia due to FMD.

Genetics of Functional Seizures; A Scoping Systematic Review.

Evidence on the genetics of functional seizures is scarce, and the purpose of the current scoping systematic review is to examine the existing evidence and propose how to advance the field. Web of science and MEDLINE were searched, from their initiation until May 2023. The following key words were used: functional neurological disorder(s), psychogenic neurological disorder(s), functional movement disorder(s), psychogenic movement disorder(s), functional seizures(s), psychogenic seizure(s), nonepileptic seizure(s), dissociative seizure(s), or psychogenic nonepileptic seizure(s), AND, gene, genetic(s), polymorphism, genome, epigenetics, copy number variant, copy number variation(s), whole exome sequencing, or next-generation sequencing. We identified three original studies. In one study, the authors observed that six (5.9%) patients with functional seizures carried pathogenic/likely pathogenic variants. In another study, the authors observed that, in functional seizures, there was a significant correlation with genes that are over-represented in adrenergic, serotonergic, oxytocin, opioid, and GABA receptor signaling pathways. In the third study, the authors observed that patients with functional seizures, as well as patients with depression, had significantly different genotypes in FKBP5 single nucleotide polymorphisms compared with controls. Future genetic investigations of patients with functional seizures would increase our understanding of the pathophysiological and neurobiological problems underlying this common neuropsychological stress-associated condition.

Diagnosis of psychogenic (functional) gait disorders

Psychogenic gait is common in patients with medically unexplained neurological symptoms and provides significant challenges to healthcare providers. Clinicians may arrive at a correct diagnosis earlier if distinctive positive signs are identified and acknowledged. Psychogenic disorders of posture and gait are common and are the major manifestation in 8–10 % of patients with psychogenic movement disorders. Psychogenic movement disorders can present with varied phenomenology that may resemble organic movement disorders. The diagnosis is based on clinical evaluation with a supporting history and classic features on neurologic examination. In functional gait disorders, walking is often bizarre and does not conform to any of the usual patterns observed with neurologic gait disorders. Astasia-abasia, an inability to stand (astasia) or walk (abasia) in the absence of other neurologic abnormalities, was the term applied by investigators in the mid to late 19thcentury to describe certain patients with a frankly functional gait. Other descriptive terms include gaits that resemble walking on ice, walking a sticky surface, walking through water (bringing to mind excessive slowness), tightrope walking, habitual limping, and bizarre, robotic, knock-kneed, trepidant, anxious, and cautious gaits. Ancillary testing, such as imaging and neurophysiologic studies, can provide supplementary information but is not necessary for diagnosis.

Botulinum Toxin Therapy for Oromandibular Dystonia and Other Movement Disorders in the Stomatognathic System.

Various movement disorders, such as oromandibular dystonia, oral dyskinesia, bruxism, functional (psychogenic) movement disorder, and tremors, exist in the stomatognathic system. Most patients experiencing involuntary movements due to these disorders visit dentists or oral surgeons, who may be the first healthcare providers. However, differential diagnoses require neurological and dental knowledge. This study aimed to review scientific advances in botulinum toxin therapy for these conditions. The results indicated that botulinum toxin injection is effective and safe, with few side effects in most cases when properly administered by an experienced clinician. The diagnosis and treatment of movement disorders in the stomatognathic system require both neurological and dental or oral surgical knowledge and skills, and well-designed multicenter trials with a multidisciplinary team approach must be necessary to ensure accurate diagnosis and proper treatment.

In Patients With Functional Movement Disorders, Is Specialized Physical Therapy Effective in Improving Motor Symptoms?: A Critically Appraised Topic.

Functional movement disorders (FMD, aka psychogenic movement disorders) are very common and frequently chronic and disabling. Despite this, there is a paucity of evidence-based treatment to manage and alleviate these conditions. Specialized physical therapy (PT), involving sequential motor relearning and redirecting attention, has shown promise as a therapeutic intervention for motor symptoms. The objective of this study was to critically assess current evidence regarding specialized PT compared with usual care in improving motor symptoms among patients with FMD. This was addressed through the development of a structured critically appraised topic. This included a clinical scenario with a clinical question, literature search strategy, critical appraisal, results, evidence summary, commentary, and bottom-line conclusions. Participants included consultant and resident neurologists, a medical librarian, and content experts in the fields of physical medicine and rehabilitation, physical and occupational therapy, psychiatry, and psychology. A randomized controlled feasibility trial was identified and selected for critical appraisal. This study randomized 60 patients with FMD to a 5-day specialized outpatient PT program or to general outpatient PT referral, and measured patient-reported and clinician-measured outcomes. At 6 months, 72% of patients in the intervention group had a good outcome compared with 18% of control group patients. Patients in the specialized outpatient PT program had significantly better outcomes in 3 Short-Form 36 (SF36) domains (d=0.46 to 0.79) and multiple other scales of physical and social function as well as clinician-measured outcomes. The intervention resulted in 0.08 additional quality-adjusted life years in a cost-effective manner. Current evidence suggests that in patients with FMD, specialized PT improves motor symptoms in a clinically significant, sustained, and cost-effective manner. This promising intervention warrants further investigation and replication.

Acute Movement Disorders in Childhood: A Cohort Study and Review of the Literature.

Acute movement disorders (AMD) are frequent in neurological and pediatric emergencies. Few studies analyzed AMD in children, none in Tunisia or other African country. The purpose of this study was to describe the peculiarities of AMD in a Tunisian pediatric population with a literature review. We conducted a retrospective descriptive study over 8 years including 80 children (sex ratio, 1.05; mean age of onset, 4.8 years) with AMD, followed in tertiary referral Child Neurology Department in North Tunisia. Acute movement disorders were mainly hyperkinetic (n = 67 with dystonia (n = 33; mostly due to inherited metabolic diseases (IMD) in 11; with status epilepticus in 10 children), chorea (n = 14; with Sydenham chorea in 5); myoclonus (n = 14; mostly with opsoclonus-myoclonus syndrome in 10) and tremor (n = 6; of posttraumatic origin in half). Hypokinetic movement disorder (MD) included acute parkinsonism in 5 children of infectious (n = 3), postinfectious (n = 1, malaria) and posttraumatic origin (n = 1). Mixed MD, found in 8 children, were mainly due to IMD in half of them, and to familial lupus in two. Paroxysmal MDs were seen in 2 children, one with multiple sclerosis and one of idiopathic origin. Psychogenic MDs were found in 7 patients mainly of dystonic type. Management of AMD comprised symptomatic treatment according to the phenomenology of the MD and causative treatment depending on its etiology. Our study illustrated the broad range of AMD in children and the wide spectrum of their etiologies. In our series, we described some exceptional findings and etiologies of AMD in children. These findings may denote a specific profile in of AMD in our country with predominant infectious, postinfectious, and IMD.

New-Onset Movement Disorders Associated with COVID-19.

Introduction:Movement disorders are increasingly described in hospitalized and milder cases of SARS-CoV-2 infection, despite a very low prevalence compared to the total patients.Methods:We reviewed the scientific literature published in English, spanning from the initial descriptions of COVID-19 until January 25, 2021, in the PubMed/MEDLINE database.Results:We identified 93 new-onset movement disorders cases (44 articles) from 200 papers screened in the database or reference lists. Myoclonus was present in 63.4% (n = 59), ataxia in 38.7% (n = 36), action/postural tremor in 10.8% (n = 10), rigid-akinetic syndrome in 5.38% (n = 5), oculomotor abnormalities in 20.4% (n = 19), catatonia in 2.1% (n = 2), dystonia in 1.1% (n = 1), chorea in 1.1% (n = 1), functional (psychogenic) movement disorders in 3.2% (n = 3) of the reported COVID-19 cases with any movement disorder. Encephalopathy was a common association (n = 37, 39.78%).Discussion:Comprehensive neurophysiological, clinical, and neuroimaging descriptions of movement disorders in the setting of SARS-CoV-2 infection are still lacking, and their pathophysiology may be related to inflammatory, postinfectious, or even indirect mechanisms not specific to SARS-CoV-2, such as ischemic-hypoxic brain insults, drug effects, sepsis, kidney failure. Cortical/subcortical myoclonus, which the cited secondary mechanisms can largely cause, seems to be the most common hyperkinetic abnormal movement, and it might occur in association with encephalopathy and ataxia.Conclusion:This brief review contributes to the clinical description of SARS-CoV-2 potential neurological manifestations, assisting clinical neurologists in identifying features of these uncommon syndromes as a part of COVID-19 symptomatology.Highlights– Movement disorders are probably uncommon neurological manifestations in SARS-CoV-2 infection;– Myoclonus is the most reported movement disorder associated with COVID-19, its clinical complications or pharmacological management;– The pathophysiology is yet not well-understood but can include systemic inflammation, autoimmune mechanisms, or hypoxia.

Evaluation of Individualized Multi-Disciplinary Inpatient Treatment for Functional Movement Disorders.

ABSTRACTBackgroundFunctional movement disorders (FMD) are associated with considerable morbidity and impairment of quality of life. Specialized treatment is scarce and data on efficacy of different therapies are limited.ObjectiveTo evaluate a multi‐modal inpatient treatment program for patients with FMD.MethodsThirty‐one patients with FMD were analyzed before (t1) and after multi‐modal inpatient treatment (t2) by a blinded video rating using the Psychogenic Movement Disorder Rating Scale (PMDRS), the simplified Functional Movement Disorder Rating Scale (S‐FMDRS), and the Clinical Global Impression Scale of Severity (CGI‐S), as well as patients' self‐rating. In 23 out of 31 patients a 5 months follow‐up investigation was performed (t3). Wilcoxon signed‐rank test and Friedman test were used for rating scale and self‐rating comparisons over time. Spearman correlation was used for correlation of symptom improvement and clinical characteristics.ResultsVideo rating revealed significant reduction of scores after therapy (median PMDRS t1 = 24, t2 = 8, P = 0.0006; S‐FMDRS t1 = 11, t2 = 4, P = 0.008; CGI‐S t1 = 4, t2 = 3, P = 0.000136) with sustained score decrease in follow‐up evaluations (PMDRS t1 = 31, t2 = 8, t3 = 7, P = 0.000032; S‐FMDRS t1 = 12, t2 = 4, t3 = 3, P = 0.000888; CGI‐S t1 = 4, t2 = 3, t3 = 3, P = 0.000032). Patients reported a stable reduction of symptoms in the self‐rating (CGI‐S t1 = 5, t2 = 4, t3 = 4, P = 0.016). Age correlated with treatment response with older patients showing better improvement, but disease duration did not correlate with outcome. Patients who suffered from physical trauma, sexual or physical abuse had smaller score reductions.ConclusionBlinded video and self‐rating assessment showed significant score reduction in patients with FMD after an individualized interdisciplinary inpatient intervention.

Increased Incidence of Functional (Psychogenic) Movement Disorders in Children and Adults Amid the COVID-19 Pandemic: A Cross-sectional Study.

Functional (psychogenic) movement disorders (FMDs) are conditions in which affected patients develop abnormal movements that are incongruous with known, organic, movement disorders, often associated with psychological stressors. In this case series, electronic medical records of all patients who presented to our adult and pediatric tertiary care movement disorders clinics between March 1 and October 30, 2020, and during the same period in 2019 were reviewed. All patients diagnosed with functional (psychogenic) movement disorder were included if they satisfied diagnostic criteria. Among 550 new patients referred for evaluation at our tertiary care movement disorders centers, 45 (8.2%) received a diagnosis of FMD; 75.6% were female, in comparison to the prior year during which time 665 new patients were evaluated and 5.1% were diagnosed with FMD. This represents a 60.1% increase (90.1% in pediatric cohort, 50.9% in adult cohort) in new patients diagnosed with FMD during the COVID-19 pandemic. Within our patient population, there has been increased incidence of FMDs in the setting of the COVID-19 pandemic, possibly reflecting increased psychological and other stressors during this period.

Management practices and long-term follow up of pediatric functional (psychogenic) movement disorder at a tertiary care center (4219)

Management practices and long-term follow up of pediatric functional (psychogenic) movement disorder at a tertiary care center (4219)

A Critical Perspective on Psychogenic Movement Disorders in Children

Psychogenic movement disorders (PMDs) are movement disorders (MDs) which occur due to psychological imbalance. These PMDs become a challenging problem for therapists as well as neurologists. The term “psychogenic” is referred to define the disorders which cannot be validated to any notorious neurochemical disease. The disorders usually exist with several difficult movements. Symptoms simulate the irregular instinctive actions. The disorders generally accomplish psychiatric conditions for a transformation illness which is one of the of somatoform disorder.

Video electroencephalogram combined with electromyography in the diagnosis of hyperkinetic movement disorders with an unknown cause.

Diagnosis of hyperkinetic movement disorders with an unknown cause is usually challenging. The objective of this study is to learn about video electroencephalogram (VEEG) combined with electromyography (EMG) in the diagnosis of hyperkinetic movement disorders with an unknown cause. We performed an observational cohort study by recruiting consecutive patients with hyperkinetic movements as the main manifestation with an unknown cause for VEEG combined with EMG evaluations. A total of 77 consecutive patients were enrolled for VEEG-EMG examination. Among them, 57 patients changed their diagnosis after VEEG-EMG assessment, with a mean final diagnosis age of 35.4 ± 20.3years (range, 4-74years). The mean duration between initial and final diagnosis was 54.8 ± 71.3months (range 0.5-300months). The most common misdiagnosed hyperkinetic movement disorders were myoclonus (40.4%), followed by tremors (24.6%), dystonia (15.8%), psychogenic movement disorders (10.5%), and periodic leg movement syndrome (PLMS) (7.0%). Outcomes of therapy were significantly improved after VEEG-EMG examination (p = 0.000). Simultaneous VEEG and EMG are important in the diagnosis of hyperkinetic movement disorders with an unknown cause.

Nocebo-Hypothesis Cognitive Behavioral Therapy (NH-CBT) for Persons With Functional Neurological Symptoms (Motor Type): Design and Implementation of a Randomized Active-Controlled Trial.

Introduction: Functional Neurological Symptom Disorders (FNSD) are associated with high levels of disability and immense direct and indirect health costs. An innovative interdisciplinary rehabilitation approach for individuals with functional neurological symptoms of motor type–Nocebo-Hypothesis Cognitive Behavioral Therapy (NH-CBT)—combines CBT and movement retraining with video feedback embedded in a comprehensive explanatory model of the etiology of FNSD.Methods: This protocol describes the development and implementation of a phase II, parallel group, randomized controlled trial with blinded outcome assessors to compare the efficacy of NH-CBT with an active control condition (supportive counseling and movement retraining). Individuals meeting diagnostic criteria of an FNSD or psychogenic movement disorder will be randomly assigned to one of the 8-week interventions. Self-report scales of motor and other physical symptoms, symptom-related psychological variables, and assessor ratings of participants' mobility will be administered at baseline, and at 8- and 16-week follow-up. Adverse events will be monitored across all sessions and therapeutic alliance will be measured at the end of therapy. The primary statistical analysis will test the hypothesis that NH-CBT is more effective than the control intervention at the 8-week follow-up.Discussion: The therapeutic strategies of NH-CBT are theory-driven by assumptions of the predictive coding model of the etiology of FNSD. Strengths and limitations of this trial will be discussed.Trial registration: Australian New Zealand Clinical Trials Registry (ANZCTR; identifier: ACTRN12620000550909).

A Case of Psychogenic Myoclonus Responding to a Novel Transcranial Magnetic Stimulation Approach: Rationale, Feasibility, and Possible Neurophysiological Basis.

Repetitive transcranial magnetic stimulation (rTMS) can relieve motor symptoms related to psychogenic movement disorders (PMDs), but the subtending neurophysiological basis is unclear. We report on a 50-year-old woman with a diagnosis of psychogenic myoclonus in the right lower limb, who was treated with a daily session (in the late morning/early afternoon) of 1 Hz rTMS over the left premotor cortex (PMC), five times a week for 6 weeks. Clinical data and EEG at rest were collected before and immediately and 2-month after the rTMS protocol completion. The patient reported a significant reduction of involuntary movement frequency and intensity and the related disability burden up to the follow-up. In parallel, any abnormality in terms of source current density within and connectivity between the frontal and parietal areas was reset. The short follow–up period, the lack of extensive neurophysiological measures, and the lack of control treatment represent the main limitation of the study. However, low-frequency rTMS over PMC seems a safe and promising approach for the management of psychogenic myoclonus owing to the combination of cortical neuromodulation and non-specific mechanisms suggesting cognitive-behavioral effects.

Neural activity in functional movement disorders after inpatient rehabilitation

Functional movement disorders (FMD) are a common source of disability in neurology.While treatment of FMD can reduce motor severity and disability, the neural mechanisms implicated in such a response remain unclear. We aimed to investigate neural changes in patients with FMD after a one-week multidisciplinary motor retraining (MoRe) treatment program. Fourteen FMD patients completed an emotional Go/No-Go fMRI task before and after MoRe treatment. Standardized pre- and post-treatment videos were rated for motor severity by a blinded reviewer using the psychogenic movement disorder rating scale (PMDRS). PMDRS scores before and after treatment were used for whole-brain regression. PMDRS scores were significantly reduced after MoRe treatment. Worse severity prior to treatment was associated with greater primary motor cortex (M1) activation at baseline and a larger response to treatment. Globally, increased connectivity between bilateral amygdala and premotor regions was observed following treatment. Lower post-treatment PMDRS scores were associated with increased connectivity between amygdala and ventromedial prefrontal cortex, whereas higher post-treatment PMDRS scores (and poorer treatment response) were associated with increased connectivity between amygdala and M1. Motor retraining in FMD may reorganize activity and connectivity in emotion processing and motor planning networks, with shifts in amygdala connectivity from posterior to frontal/prefrontal regions.

Opinions and clinical practices related to diagnosing and managing functional (psychogenic) movement disorders: changes in the last decade.

There is large variability in the diagnostic approach and clinical management in functional movement disorders (FMD). This study aimed to examine whether opinions and clinical practices related to FMD have changed over the past decade. Adapted from a 2008 version, we repeated the survey to members of the International Parkinson and Movement Disorder Society (MDS). In all, 864/7689 responses (denominator includes non-neurologists) were received from 92 countries. Respondents were more often male (55%), younger than 45 (65%) and from academic practices (85%). Although the likelihood of ordering neurological investigations prior to delivering a diagnosis of FMD was nearly as high as in 2008 (47% vs. 51%), the percentage of respondents communicating the diagnosis without requesting additional tests increased (27% vs. 19%; P=0.003), with most envisioning their role as providing a diagnosis and coordinating management (57% vs. 40%; P<0.001). Compared to patients with other disorders, 64% of respondents were more concerned about missing a diagnosis of another neurological disorder. Avoiding iatrogenic harm (58%) and educating patients about the diagnosis (53%) were again rated as the most effective therapeutic options. Frequent treatment barriers included lack of physician knowledge and training (32%), lack of treatment guidelines (39%), limited availability of referral services (48%) and cultural beliefs about psychological illnesses (50%). The preferred term for communication favored 'functional' over 'psychogenic' (P<0.001). Attitudes and management of FMDs have changed over the past decade. Important gaps remain in access to treatment and in the education of neurologists about the inclusionary approach to FMD diagnosis.

Clinical Characteristics of Functional Movement Disorders in the Stomatognathic System.

Background: Functional (psychogenic) movement disorders often have distinguishable clinical features in the orofacial region. Tonic mandibular deviation accompanying ipsilateral downward and lateral lip pulling is the most common phenotype seen in patients with facial functional movement disorders. However, functional movement disorders in the stomatognathic system are underrecognized.Objective: This study aimed to evaluate clinical characteristics and phenomenology in patients with functional movement disorders in the stomatognathic system.Methods: Ten-item inclusion criteria (point range: 0–10) for functional movement disorders in the stomatognathic system was produced, based on previously established criteria for functional movement disorders and general signs of functional facial dystonia, to determine subject inclusion. The criteria included inconsistency, incongruence, and paroxysm in symptoms; rapid onset; distractibility; suggestibility; static course; spreading to multiple sites; spontaneous remission; and lack of sensory tricks. Fifty-eight patients [42 women (72.4%), 16 men (27.6%); mean age: 46.2 years] scored over 7 points on the criteria and were included in further analyses. Characteristic features, including the pattern and site of abnormal movements, were assessed in clinical examination.Results: Frequent items in the scale were inconsistent symptoms (93.1%), incongruous symptoms (91.4%), spreading to multiple sites (89.7%), paroxysmal symptoms (86.2%), and lack of sensory tricks (81%). Sixty percent of patients exhibited a pattern resembling dystonia. Some patients had a combination of organic and functional disease. Common involuntary movements included jaw deviation (74.1%), jaw closing (50%), lip pulling (34.5%), and tongue movement (31%). A functional dystonia phenotype (unilateral lower lip pulling and jaw deviation) was observed in 26 patients (44.8%). Characteristic features of functional stomatognathic movement disorders were rapidly repeating mandibular (lateral or tapping) and tongue movements (27.6%), which fluctuated in speed and direction.Conclusion: In 58 patients with functional movement disorders in the stomatognathic system, the functional dystonia phenotype was observed in 44.8%. Furthermore, 27.6% of patients showed the most characteristic type of functional stomatognathic movement disorders: very fast repeated jaw and/or lingual movements.