Latency of Motion Onset Response as an Integrative Measure of Processing Sound Movement

Abstract

Abstract— The characteristics of a specific event-related potential elicited by sound motion onset (motion-onset response, MOR) were estimated. Moving sound stimuli with delayed motion onset were presented to right-handed subjects in dichotic conditions. Sound motion was produced by linear changes of interaural time differences. The amplitude and latency of cN1 and cP2 components of evoked potentials were measured in a wide range of velocities. The latency of cN1 increased linearly with the increase in time of 1° azimuthal shift of a stimulus, whereas the cP2 latency remained nearly constant. The time interval of motion integration was about 140–180 ms. Thus, the latency of cN1 deflection may be considered as an electrophysiological correlate of integrative neuronal processes activated by sound motion presented as a separate auditory event.