The goal was to test whether band-limited sensory noises with adequate amplitudes, by the principle of stochastic resonance, could enhance mu and beta wave suppressions. Scalp EEG was recorded while the subject performed thumb movements in the presence of vibratory noises applied to thenar belly or thumb tip. Seven subjects without clear mu or beta wave suppression in the absence of the mechanical stimuli were recruited. The results showed that when the stimuli were applied to the thenar belly, both mu and beta wave suppressions were enhanced in a bell-shaped trend (the characteristics of stochastic resonance) in four subjects.