The acupoint on the back of the thumb is LI4 (Large Intestine 4), also known as Hegu, located on the fleshy web between the base of the thumb and index finger, and Hand Arm Vibration: Awareness MSD Prevention Guideline for Ontario Transmissibility of mechanical vibration from the fingertip to phalanxes ScienceDirect Finger Twitching as an Early Parkinson's Symptom APDA Full article: Detection of diabetic peripheral neuropathy from index finger using vibration mechanism
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index finger vibration Neural evidence for action-related somatosensory predictions