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Related Experiment Video

Updated: Jun 22, 2026

Single-stage Dynamic Reanimation of the Smile in Irreversible Facial Paralysis by Free Functional Muscle Transfer

Single-stage Dynamic Reanimation of the Smile in Irreversible Facial Paralysis by Free Functional Muscle Transfer

Published on: March 1, 2015

Tremor on smiling.

Petra Schwingenschuh¹, Carla Cordivari, Julia Czerny

¹Sobell Department of Motor Neuroscience and Movement Disorders, UCL, Institute of Neurology, Queen Square, London, United Kingdom.

Movement Disorders : Official Journal of the Movement Disorder Society

|June 3, 2009

Summary

This summary is machine-generated.

Facial tremor on smiling is rare. This study details two cases, one with Parkinson's disease, highlighting this distinct tremor possibly linked to risorii muscle activation.

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Dynamic Digital Biomarkers of Motor and Cognitive Function in Parkinson's Disease

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Area of Science:

Neurology
Movement Disorders

Background:

Facial tremor is an uncommon neurological symptom.
Tremor specifically associated with smiling has been rarely documented in medical literature.

Observation:

Two patients presented with bilateral facial tremors exclusively during smiling or activation of the risorii muscles.
The tremors were characterized by a high frequency of 9 Hz.

Findings:

One patient had concurrent young-onset Parkinson's disease; the other exhibited no additional neurological deficits.
Standard anti-Parkinsonian medications did not alleviate the facial tremor in the affected Parkinson's patient.

Implications:

Smiling-induced facial tremor may represent a distinct clinical entity.
This tremor could potentially be associated with specific subtypes or presentations of Parkinson's disease.