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. 2026 Aug 18;28:e91756. doi: 10.2196/91756

Figure 4.

Figure 4

Quality issues in the finger-tapping task. Participants’ hands often moved out of the recording frame while tapping, and in some cases, multiple persons were visible, making it difficult for machine learning–based models to focus on the subject of interest. In addition, poor background lighting or contrast reduced hand visibility, which is crucial for reliable assessment of this task.