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<p>Progressive supranuclear palsy (PSP) is a rare neurodegenerative disorder characterized by 4-repeat tau deposition, whose symptoms overlap with Parkinson’s disease (PD). It is necessary to develop objective biomarkers for accurate differentiation. This study used video-based kinematic analysis to assess finger-tapping performance in 31 PSP patients, 31 PD patients, and 30 healthy controls (HC). Results showed PSP patients exhibited smaller finger-tapping angles, slower velocities, shorter cycle durations, and no sequence effect compared with PD patients and HCs. The average finger-tapping angle effectively distinguished PSP from PD (AUC = 0.83). In PSP, smaller angles and velocities correlated with worse motor and balance function, and these finger tapping parameters were associated with volumes of nucleus accumbens, superior temporal gyrus, cerebellum, and brainstem. Video-based finger-tapping kinematic analysis serves as a non-invasive biomarker for PSP diagnosis and motor assessment.</p>

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Distinct finger-tapping feature in progressive supranuclear palsy correlates with motor function and brain atrophy

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月8日

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  • Zijian Chen,
  • Wenwen Xu,
  • Ruonan Duan,
  • Min Tian,
  • Qingchao Yang,
  • Yue Yin,
  • Xiao Tang,
  • Tianrui Wen,
  • Dandan Guo,
  • Yiming Liu

摘要

Progressive supranuclear palsy (PSP) is a rare neurodegenerative disorder characterized by 4-repeat tau deposition, whose symptoms overlap with Parkinson’s disease (PD). It is necessary to develop objective biomarkers for accurate differentiation. This study used video-based kinematic analysis to assess finger-tapping performance in 31 PSP patients, 31 PD patients, and 30 healthy controls (HC). Results showed PSP patients exhibited smaller finger-tapping angles, slower velocities, shorter cycle durations, and no sequence effect compared with PD patients and HCs. The average finger-tapping angle effectively distinguished PSP from PD (AUC = 0.83). In PSP, smaller angles and velocities correlated with worse motor and balance function, and these finger tapping parameters were associated with volumes of nucleus accumbens, superior temporal gyrus, cerebellum, and brainstem. Video-based finger-tapping kinematic analysis serves as a non-invasive biomarker for PSP diagnosis and motor assessment.