The Effect of Tongue Vibration Exercise Combined With Oromotor Training on Tongue Function in Older Adults Chen 2026 Journal of Oral Rehabilitation Wiley Online Library The four philosophical Elements are what comprise all physical aspects of Creation. They are Fire, Water, Air, and Earth. These Four Elements arise from the Trinity of the three philosophical Principles of Vibration Application of biomimetic tongue substrate to investigate the role of friction and vibration in sensory texture perception ScienceDirect