Ultrafast tracking of sound location changes as revealed by human auditory evoked potentials

► Rare changes in sound location modulate the auditory responses at 20 ms after onset. ► The activity increase originates dominantly from the contralateral auditory cortex. ► At a latency of 160-190 ms, location changes elicit additionally a mismatch negativity. ► Change detection is an early-initiating pervasive property of the auditory system.