This invention generally provides two tactile stimulation modules, or “tappers”. One tapper is held by a person in each of his hands. Alternatively, a tapper is secured to each wrist or to other parts of the body on opposite sides. Each tapper is powered by a rechargeable battery, and contains both a tactile stimulation transducer, such as an electric motor having either a balanced or unbalanced mass on its output shaft, and a transceiver that communicates with a host or master. Each tapper includes at least one control button and a status indicator. Each tapper contains a micro-controller that performs tasks such as communication, motor activation, user monitoring and control, battery monitoring, low-power sleep, and algorithm execution. At least one tapper can contain at least one optional sensor, which measures a physiological function. Measurements can be used to modify performance of the tactile stimulation transducers.