Abstract
The influence of relative spatial positions of sound stimuli and background masker on the event related potentials (ERPs) evoked by sound offset was investigated. Sound stimuli were presented dichotically, the position of sound images was manipulated using interaural level differences. Test signals were presented in silence or against the background of a masker. Signal and masker were either co-located or separated by 90 or 180 deg of azimuth. Co-location of signal and masker resulted in amplitude decrease and latency increase in the N1, P2 and N2 components. When angular distance between signal and masker increased, the amplitude recovered almost to the initial level and the latency of all components became shorter. The present findings are in line with the view that offset response is essential for target stimulus detection in the background noise.
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