Performing or listening to music activates a variety of structures in the brain that are involved in thinking, sensation, movement, and emotion. These brain effects may have physical and psychological benefits. For example, music causes the release of brain chemicals (neurotransmitters and hormones) that can evoke emotional reactions, memories, and feelings and promote social bonds. Music can even affect the structure of the brain. Certain structures in the brain have been found to be larger in musicians than nonmusicians, with particularly noticeable changes in people who started their musical training at an early age.