Figure 7.17: Locating a sound Sound waves coming from the left (sound B) reach the left ear sooner than the right ear. The converse would be true of sound waves coming from the right. Neurons receiving input from the two ears are sensitive to this difference, which provides a code for sound localization. Without moving the head, it is difficult to distinguish a sound in front of the head from one that is at the same angle in back of the head, but a head rotation quickly resolves that problem.