The invention relates to methods and compositions for promoting cognitive function andor treating cognitive function disorders and impairments. In one particular embodiment, a silicon germanium layer is provided in the active area having a high concentration of point defects due to relaxing the strain of the silicon germanium layer upon heat treating the transistor element. Each pump chamber housing includes a pump chamber shell mating with one of the discs with a flexible diaphragm therebetween. When a user presses the start button and shakes the bracelet, the tilt switch sends a signal to the microprocessor whereupon the microprocessor causes the audio device to produce a short beep sound and then randomly selects one of a plurality of messages stored in the microprocessor and displays the message on the digital display for a predetermined period of time.