# Does Right‐Hand Motor Impairment Affect Performance on Cognitive Testing in Parkinson's Disease?

## TL;DR

This study investigates whether right-hand motor impairment in Parkinson's disease affects cognitive test performance, finding no significant impact.

## Contribution

The study provides evidence that motor impairment in the dominant hand has minimal effect on graphomotor cognitive tasks in Parkinson's patients.

## Key findings

- No statistically significant associations were found between right upper extremity impairment and graphomotor test performances.
- Dominant hand motor impairment in Parkinson's disease has minimal impact on cognitive testing involving graphomotor tasks.

## Abstract

For People with Parkinson's (PwP), motor disturbances affecting the dominant upper extremity often impacts ability to perform tasks such as writing or typing and may confound cognitive test performances with graphomotor responding.

We explored association between upper extremity impairment and graphomotor cognitive test performances in a clinical sample of moderately advanced PwP pursuing Deep Brain Stimulation (DBS).

A retrospective chart review was conducted of 80 consecutive right hand dominant PwP who completed pre‐DBS neuropsychological evaluations. Right upper extremity (RUE) impairment was measured using MDS‐UPDRS Part 3. Non‐parametric correlations examined associations between RUE impairment and tests involving graphomotor (trail making, letter cancellation, visual memory) versus oral responding (fluency, digit span, verbal memory).

No statistically significant associations were observed between RUE motor impairment and graphomotor test performances.

Minimal impact of dominant RUE impairment on graphomotor tasks in moderately advanced PwP supports application in clinical and research settings.