What does this research mean for the field?

Progressive micrographia in Parkinson's disease is associated with a multidimensional combination of cognitive and motor features, extending beyond isolated handwriting or motor impairment. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To investigate the motor, cognitive, and disease-related clinical characteristics associated with progressive micrographia in individuals with Parkinson's disease.

September 14, 2026Journal of Neural TransmissionOpen Access

Progressive micrographia in Parkinson’s disease is associated with multidimensional cognitive and motor features

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Authors

HHHiroyuki HamadaThe University of Tokyo KMKyohei MikamiThe Japanese Society of Gastroenterological Surgery YIYoshihiro ItaguchiKeio University

Discussion

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Implication

Observational study reveals progressive micrographia is linked to combined motor and cognitive deficits in Parkinson's disease, suggesting handwriting shrinkage reflects widespread impairment.

Key Points

To investigate the motor, cognitive, and disease-related clinical characteristics associated with progressive micrographia in individuals with Parkinson's disease.
Assessed 39 individuals with Parkinson's disease classified into progressive micrographia (n = 14) and non-progressive micrographia (n = 25) cohorts using healthy older adult normative handwriting data.
Evaluated participants through handwriting assessments, the Mini-Mental State Examination, the MDS-Unified Parkinson's Disease Rating Scale Part III, disease duration, and levodopa equivalent daily dose.
Trained and evaluated four machine learning models (logistic regression, elastic net logistic regression, linear support vector machine, and radial basis function support vector machine) with nested leave-one-out cross-validation.
The linear support vector machine attained the highest numerical discriminative performance, yielding an area under the receiver operating characteristic curve of 0.877 (95% CI, 0.749–0.977) and an accuracy of 82.1%.
Feature contribution analyses showed that classification of progressive micrographia relies on a multidimensional combination of cognitive and motor features rather than handwriting impairment alone.

Cite This Study

Hamada et al. (2026) studied this question.

synapsesocial.com/papers/6aa7b3bf0926e14a848b2f3c https://doi.org/10.1007/s00702-026-03289-8

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Implication

Observational study reveals progressive micrographia is linked to combined motor and cognitive deficits in Parkinson's disease, suggesting handwriting shrinkage reflects widespread impairment.

Progressive micrographia in Parkinson’s disease is associated with multidimensional cognitive and motor features

Discussion

Member takes

Implication

Key Points

Cite This Study

Progressive micrographia in Parkinson’s disease is associated with multidimensional cognitive and motor features

Discussion

Member takes

Implication

Key Points

Cite This Study

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