Quantitative Assessment of Finger-Tapping Performance in Patients With Parkinson's Disease

Objective: The objective, quantitative assessment of patients with Parkinson's disease (PD) is essential for both the diagnosis and follow-up. To be of value in clinical trials and daily clinical practice, the method should be simple and easy, with minimal inter-rater observer variation. The finger-tapping (FT) test is an informative measure of upper-extremity motor skills as a part of the neurological assessment of patients with PD. Therefore, this study evaluated the motor skills of patients with PD by using a computer-based system that quantifies FT performance.Method: Software to measure FT performance was assessed in 25 patients with PD and 25 normal controls by using two FT testing procedures: single FT (SFT) and alternate FT (AFT). Confounding factors that had the potential to affect the performance were considered, including age, sex, education, and cognition.Results: The SFT and AFT scores for the affected side of patients with PD were significantly lower than the corresponding scores for the dominant side of control subjects. In PD patients, our method appeared to be adequate for evaluating bradykinesia independent of age, cognition and education. AFT was a more sensitive tool for determining the disease severity.Conclusion: This method is a sensitive, practical, and objective tool for evaluating upper-extremity motor skills in patients with PD. It also reflects the disease severity. We hope that this method might be useful in both daily practice and clinical studies.