The invention relates to a method to modify the excitability of the neuronal networks, comprising the application of vibration inducing muscular lengthening-shortening sequences with frequencies within the range of 1 and 300 Hz, with peak to peak motion amplitude included within the range from 1null and the maximum physiological length of the muscle, with an application time between 1 and 60 minutes. The invention also relates to the apparatus for performing the above mentioned method.