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At about what frequency do separate touches begin to feel like a continuous vibration?
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Mechanoreception
In human skin, specialized nerve endings known as Meissner's corpuscles (or tactile corpuscles) are sensitive to touch. They are one of several different types of mechanoreceptors found in human skin.
For humans, separate tactual stimuli begin to fuse into a distinct, continuous vibratory sensation at a threshold frequency of approximately 15 cycles per second (cps).1