If the phase of the peaks in the sound wave arriving at the left ear is slightly ahead of the phase of the peaks arriving at the right ear our ear-brain system interprets the sound as coming from the ...If the phase of the peaks in the sound wave arriving at the left ear is slightly ahead of the phase of the peaks arriving at the right ear our ear-brain system interprets the sound as coming from the left. This has the practical result that sound from speakers in a concert hall which are too far apart in the horizontal direction do not sound right; we are not easily fooled into thinking the sound is coming from the center of the stage where the performers are.