Left hemisphere is more verbal, right hemisphere is more spatial. Melodies, sonar signals, and environmental sounds are better perceived when presented to the left ear (with connections to the Right Hemisphere). When verbal stimuli are used, subjects perform more accurately with information presented to the right visual field and ear (with connections to the Left Hemisphere). (Williams, Linda. Teaching for the Two-Sided Mind. p 18-30. CA: Touchstone Books: 1986.)