Abstract: The neural basis of locating and psychologically determining sound source has been demonstrated by a lot of neural electrophysiological studies. Sound source location has resulted from the complicated integration in auditory system. The great ability of auditory central neuron in sound location is achieved by comparing the difference in characters of sound signals arrived at two ears. The auditory midbrain nucleus, inferior colliculus (IC), plays an important role in processing the information of sound location. Many binaural response neurons in one IC may decode the sound location information, moreover interactions between two ICs are likely to modulate the binaural auditory responses.

Key words: auditory midbrain, sound localization, neural modulation