Table 4.

Finger-tapping task quality checklist.

Rule/issue		Penalty
Background contrast and blurriness
	Dark/low-contrast background or blurry video, but hand remains clearly visible	1 point
	Hand visibility impaired	2 points
Multiple hands in frame
	Another hand visible in background but not tapping	1 point
	Background person also tapping	2 points
Distance from camera
	Head-and-shoulders framing (headshot)	OK
	Waist visible in frame	1 point
	Lower body (eg, knees) visible; participant too far from camera	2 points
Wrist visibility
	Wrist is briefly out of frame only at start/end; at least 5 consecutive taps fully visible	OK
	Wrist partially visible (not fully in frame)	1 point
	Wrist completely out of frame for >2 s during task	2 points
Tap count
	8-12 taps (within ±2 of prescribed 10)	OK
	6-7 or 13-14 taps (deviation of 3-4)	1 point
	<6 or >14 taps (larger deviation)	2 points
Idle time
	Idle period >5 s before or after the task	1 point
	Idle period >5 s during task execution	2 points
Noncompliance (any of the following)
	No valid finger-tapping recording; invalid duration (too short ≤3 s or too long ≥20 s); aspect ratio inconsistent with standard computer webcams; unstable/shaky camera	2 points