Abstract

At present there are four different theories as to the mechanism by which vibratory stimuli are perceived. Early clinical studies made with the vibrating tuning fork as the source of stimulation convinced many investigators that vibration sensibility was nothing more than the perception of repetitive mechanical stimuli delivered to the so-called deep receptors. Among these are included the pressure receptors of the skin and subcutaneous tissues, which are stimulated by mechanical forces that deform the surface of the skin, as well as those sense organs which respond to mechanical stimulation and lie in the fascia, muscles, tendons, joint capsules and periosteum of bones. Later, under the stimulus of work by von Frey,1the opinion arose that vibration was perceived by means of repetitive mechanical stimulation to the tactile receptors located in the skin and not by any other sense organs. Von Frey expressed the belief that the bone to

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