Journal of Movement Disorders

Brief communication

Quantification of loudness instability in tone production in embouchure dystonia: André Lee, Tobias Mantel, Shinichi Furuya, Masanori Morise, Eckart Altenmüller, Bernhard Haslinger; Received September 3, 2025 Accepted December 22, 2025 Published online December 24, 2025; DOI: https://doi.org/10.14802/jmd.25235 [Accepted]

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Abstract PDF: Embouchure dystonia (ED) is a task-specific disorder of voluntary fine motor control that has a severe impact on musicians’ ability to perform. One critical skill for professional musicians is the ability to produce sustained notes with an even loudness, however this ability in ED has not been well defined. The present study therefore examined the time-varying dynamics of loudness in ED compared to healthy musicians, as well as its relationship to F0 variability, applying sound analysis of sustained notes. The findings revealed a significantly greater varia-bility with respect to both loudness and F0 among ED patients. Furthermore, loudness and F0 variability were strongly correlated, suggesting a shared pathological basis. We conclude that F0 variability and loudness instability are reliable measures for objectively characterising ED and assisting accurate diagnosis. The incorporating of quantitative acoustic tools into future diagnostic and therapeutic frameworks has the potential to enhance the objectivity and repro-ducibility of ED assessment.

Review Article

Functional Movement Disorders: Updates and Clinical Overview: Jung E Park; J Mov Disord. 2024;17(3):251-261. Published online July 1, 2024; DOI: https://doi.org/10.14802/jmd.24126

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Functional movement disorder (FMD) is a type of functional neurological disorder that is common but often difficult to diagnose or manage. FMD can present as various phenotypes, including tremor, dystonia, myoclonus, gait disorders, and parkinsonism. Conducting a clinical examination appropriate for assessing a patient with suspected FMD is important, and various diagnostic testing maneuvers may also be helpful. Treatment involving a multidisciplinary team, either outpatient or inpatient, has been found to be most effective. Examples of such treatment protocols are also discussed in this review. While recognition and understanding of the disorder has improved over the past few decades, as well as the development of treatments, it is not uncommon for patients and physicians to continue to experience various difficulties when dealing with this disorder. In this review, I provide a practical overview of FMD and discuss how the clinical encounter itself can play a role in patients’ acceptance of the diagnosis. Recent neuroimaging studies that aid in understanding the pathophysiology are also discussed.

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Brief communication

COVID-19 Vaccine-Related Movement Disorders: A Systematic Review: Grace Elysse D. Angeles, Lowrence Precious C. Dichoso, Roland Dominic G. Jamora; J Mov Disord. 2024;17(3):322-327. Published online March 19, 2024; DOI: https://doi.org/10.14802/jmd.24001

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Abstract PDF Supplementary Material: Objective
Since the release of vaccines against coronavirus disease 2019 (COVID-19), there have been reports of vaccine-related neurologic complications. This study aimed to perform a descriptive systematic review of movement disorders associated with COVID-19 vaccines.
Methods
We described the demographics, clinical presentation, management, outcomes, and proposed pathomechanism of the patients. A systematic review was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. A standardized tool was used to assess the quality of the cases.
Results
We identified 8 articles that met our inclusion criteria; these articles included 10 patients who developed movement disorders after vaccination. The majority were males (n = 8), with a median age of 64.5 years. The most common movement disorder was hemichorea. The rest presented with generalized chorea with myoclonus, cervical dystonia, and akathisia. Most patients respond to immunotherapy. The standardized tool used showed that most studies had a low risk of bias.
Conclusion
The reported incidence of vaccine-related movement disorders was low based on available published cases.

Review Articles

Nine Hereditary Movement Disorders First Described in Asia: Their History and Evolution: Priya Jagota, Yoshikazu Ugawa, Zakiyah Aldaajani, Norlinah Mohamed Ibrahim, Hiroyuki Ishiura, Yoshiko Nomura, Shoji Tsuji, Cid Diesta, Nobutaka Hattori, Osamu Onodera, Saeed Bohlega, Amir Al-Din, Shen-Yang Lim, Jee-Young Lee, Beomseok Jeon, Pramod Kumar Pal, Huifang Shang, Shinsuke Fujioka, Prashanth Lingappa Kukkle, Onanong Phokaewvarangkul, Chin-Hsien Lin, Cholpon Shambetova, Roongroj Bhidayasiri; J Mov Disord. 2023;16(3):231-247. Published online June 13, 2023; DOI: https://doi.org/10.14802/jmd.23065

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Abstract PDF Supplementary Material

Clinical case studies and reporting are important to the discovery of new disorders and the advancement of medical sciences. Both clinicians and basic scientists play equally important roles leading to treatment discoveries for both cures and symptoms. In the field of movement disorders, exceptional observation of patients from clinicians is imperative, not just for phenomenology but also for the variable occurrences of these disorders, along with other signs and symptoms, throughout the day and the disease course. The Movement Disorders in Asia Task Force (TF) was formed to help enhance and promote collaboration and research on movement disorders within the region. As a start, the TF has reviewed the original studies of the movement disorders that were preliminarily described in the region. These include nine disorders that were first described in Asia: Segawa disease, PARK-Parkin, X-linked dystonia-parkinsonism, dentatorubral-pallidoluysian atrophy, Woodhouse-Sakati syndrome, benign adult familial myoclonic epilepsy, Kufor-Rakeb disease, tremulous dystonia associated with mutation of the calmodulin-binding transcription activator 2 gene, and paroxysmal kinesigenic dyskinesia. We hope that the information provided will honor the original researchers and help us learn and understand how earlier neurologists and basic scientists together discovered new disorders and made advances in the field, which impact us all to this day.

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Genetic heterogeneity of early onset Parkinson disease: The dilemma of clinico-genetic correlation
Roopa Rajan, Vikram V. Holla, Nitish Kamble, Ravi Yadav, Pramod Kumar Pal
Parkinsonism & Related Disorders.2024; 129: 107146. CrossRef

Historical and More Common Nongenetic Movement Disorders From Asia: Norlinah Mohamed Ibrahim, Priya Jagota, Pramod Kumar Pal, Roongroj Bhidayasiri, Shen-Yang Lim, Yoshikazu Ugawa, Zakiyah Aldaajani, Beomseok Jeon, Shinsuke Fujioka, Jee-Young Lee, Prashanth Lingappa Kukkle, Huifang Shang, Onanong Phokaewvarangkul, Cid Diesta, Cholpon Shambetova, Chin-Hsien Lin; J Mov Disord. 2023;16(3):248-260. Published online June 9, 2023; DOI: https://doi.org/10.14802/jmd.22224

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Abstract PDF Supplementary Material

Nongenetic movement disorders are common throughout the world. The movement disorders encountered may vary depending on the prevalence of certain disorders across various geographical regions. In this paper, we review historical and more common nongenetic movement disorders in Asia. The underlying causes of these movement disorders are diverse and include, among others, nutritional deficiencies, toxic and metabolic causes, and cultural Latah syndrome, contributed by geographical, economic, and cultural differences across Asia. The industrial revolution in Japan and Korea has led to diseases related to environmental toxin poisoning, such as Minamata disease and β-fluoroethyl acetate-associated cerebellar degeneration, respectively, while religious dietary restriction in the Indian subcontinent has led to infantile tremor syndrome related to vitamin B12 deficiency. In this review, we identify the salient features and key contributing factors in the development of these disorders.

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Diabetic striatopathy and other acute onset de novo movement disorders in hyperglycemia
Subhankar Chatterjee, Ritwik Ghosh, Payel Biswas, Shambaditya Das, Samya Sengupta, Souvik Dubey, Biman Kanti Ray, Alak Pandit, Julián Benito-León, Rana Bhattacharjee
Diabetes & Metabolic Syndrome: Clinical Research & Reviews.2024; 18(3): 102997. CrossRef
Tremors in Infantile Tremor Syndrome Mimicking Epilepsia Partialis Continua
Tonyot Gailson, Pradeep Kumar Gunasekaran, Arushi Gahlot Saini, Chaithanya Reddy
Journal of Movement Disorders.2024; 17(3): 351. CrossRef

Adult-Onset Genetic Leukoencephalopathies With Movement Disorders: Mu-Hui Fu, Yung-Yee Chang; J Mov Disord. 2023;16(2):115-132. Published online March 7, 2023; DOI: https://doi.org/10.14802/jmd.22127

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