Functional Tremor

Objective markers that support differential diagnosis at screening

Functional (psychogenic) tremor is a frequent source of misclassification in tremor trials. Kinematic signatures of functional tremor differ from organic tremor in frequency variability, entrainment, and distractibility. NeuroQuantix provides objective markers that support screening decisions and enrollment quality in essential tremor and Parkinson disease programs.

Published evidence on digitized spiral analysis supports continuous, rater-independent motor measurement; the strength of that evidence for this condition is stated on this page. NeuroQuantix standardizes this evidence into a pre-specified endpoint for your program.

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Quantified

Frequency Variability

Moment-to-moment spectral peak variance across the assessment

Quantified

Amplitude Fluctuation

Envelope variability of tremor amplitude

Screening

Use in Trials

Enrollment quality, not diagnosis

Emerging

Evidence Status

Scoping review, Wang et al., 2025

The Enrollment Quality Challenge

Tremor trials enroll on clinical diagnosis, and functional tremor is among the most common misclassifications. Each misclassified participant adds variance and can respond to placebo or distraction in ways that obscure the drug effect. Objective kinematic markers of frequency variability and amplitude fluctuation give investigators and sponsors a screening aid that protects the trial without adding a specialist visit.

Clinical Applications

Enrollment quality screening in essential tremor and Parkinson disease trials

Exploratory descriptors of tremor stability in tremor programs

Functional movement disorder research collaborations

Published Evidence

Evidence from peer-reviewed publications supporting digital kinematic endpoints for functional tremor assessment. View the full evidence base.

Kinematic Differentiation of Tremor Types

The published spiral literature includes studies differentiating tremor etiologies by frequency stability and spectral characteristics, which underpin the functional tremor markers in the platform.

Scoping review: Wang S, et al. Movement Disorders Clinical Practice, 2025

Statistical Power Advantage

Higher measurement precision translates directly into smaller enrollment requirements. See the full interactive power curve comparison on the NeuroQuantix platform page.

View Power Visualization

Frequently Asked Questions

How does functional tremor differ kinematically from essential tremor?

Functional tremor typically shows greater moment-to-moment frequency variability, entrainment to voluntary rhythmic movement of another limb, and changes with distraction, whereas essential tremor holds a stable frequency. Spiral drawing kinematics quantify frequency variability and amplitude fluctuation across the assessment, giving objective markers that complement clinical examination.

Why does functional tremor matter for clinical trial sponsors?

Misclassified participants dilute the treatment effect. A patient with functional tremor enrolled in an essential tremor trial contributes noise and can respond unpredictably. Objective screening markers improve enrollment quality, which protects power without increasing sample size.

Can NeuroQuantix diagnose functional tremor?

No. The platform provides objective kinematic markers that support the clinical differential; diagnosis remains a clinical judgment. In a trial setting the markers are used for enrollment quality screening and as exploratory descriptors, not as a diagnostic claim.