[Effect of interaural phase differences on inferior colliculus activity during binaural stimulation with tonal signals].

The frequency-following response (FFR) of the inferior colliculus depends greatly of the interaural phase differences (delta phi). The function of the FFR amplitude of delta phi shows periodicity, with different phase shifts (in relation to delta phi = 0) at different electrode location and with different sound frequencies or intensities. The maximal FFR sensitivity (in microV) to delta phi (in degrees) may be as high as 60 microV/10 degr. or for interaural time differences--15 microV/10 microsec. Such a sensitivity might provide for binaural phase sensitivity near to the sensitivity of the human auditory system.