The precedence effect for signals moving in the horizontal plane

Abstract

The precedence effect refers to a group of auditory phenomena related to the ability to locate sound sources in reverberant environments. In the present study, this phenomenon was investigated using two moving signals. The first signal was direct (lead) and the other was delayed (lag). The motion of the sound source was created by successive switching of ten loudspeakers. The continuity of the motion was created by simultaneously attenuating the stimulus in the previous loudspeaker and enhancing it in the next one. The length of the path of the lead and lag was 34°. The lead moved from 34° to 0° (to the right) and the lag moved –52° to –86° (to the left). The duration of the lead and the lag was 1 s. Lead–lag delays ranged from 1 to 40 ms. Subjects had to indicate the location of the lag. The results indicate that the lead signal dominated in the sound localization at short delay durations (up to 18 ms). In spite of the instructions, all the subjects pointed at the lead, which suggests that they perceived the lag in this location. Two distinct sounds were perceived at the longest delays. The mean echo threshold and its standard deviation in eight subjects was 9.6 ± 4.5 ms.

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