Understanding How to Best Transform Speech into Tactile Vibrations Could Benefit Hearing Impaired People Georgetown University Medical Center Georgetown University Free and Forced Vibration Modes of the Human Fingertip 10 second finger tap, 10 Seconds Finger tap test. Simple. Powerful. Underrated., We use it daily to assess patients., Ask someone to tap their index finger and thumb as fast as possible for 10 Reaching and Grasping With a Sensory Substitution Glove: Variability of Practice Effects