[Binaural evoked brain stem potentials. Effect of sound direction on inferior colliculus response].

Auditory evoked brain-stem responses were recorded using binaural stimulation on 12 test subjects. Rotation of the sound source in the horizontal plane was simulated digitally using a binaural mixing console. Binaural processing in the inferior colliculus was thus demonstrated in humans. The amplitude of the inferior colliculus response depends in an almost linear manner on sound direction and presents a typical directionality. While the amplitude is considered an important central code of sound direction, response latency of the inferior colliculus is controversial. The results confirm neuronal mechanisms which had been established by animal experiments for single units of the inferior colliculus and the auditory cortex.