Evoked Potentials to the Movement of Sound Stimuli with Interaural Intensity Differences

This paper reports studies of evoked potentials in the human brain arising in response to the onset of sound stimulus motion (motion-onset responses, MOR) created by linear changes in interaural level differences (ILD). The structure of MOR with changes in ILD coincided with the responses described in the literature obtained with changes in interaural time differences. The amplitude of the cN1 component increased with the speed of motion, regardless of its direction, while that of the cP2 component increased only on movement from the center to the periphery. The amplitudes of the cP1 and cN2 components were independent of motion speed. Centrifugal motion evoked a greater response than centripetal motion, which corresponds to the hemifield model of lateralization (the opponent channel model). The characteristics of the MOR potential reflected information on the direction of motion (towards the center or towards the periphery) over a wider time interval than information on speed.