This study will examine the central regions and brain activation patterns associated with simple vocal behaviors under conditions of normal auditory feedback-when people hear themselves speak. Such feedback plays a major role in learning and maintaining human voice control. But voice control can be harmed by neurological injury or disease, reducing the ability of a person to orally communicate. Research has shown that auditory feedback is continuously monitored, brought about by both automatic and voluntary corrections in the amplitude (loudness) and frequency of (pitch) of the human voice. This study aims to determine which areas of the brain have activity dependent on the level of blood oxygen. It will provide new knowledge about basic vocal motor control and provide a basis for investigations into the integration of hearing and speaking in human vocal expression throughout life.