Precedence effect

Psychoacoustical phenomenon

The precedence effect or law of the first wavefront is a binaural psychoacoustical effect concerning sound reflection and the perception of echoes. When two versions of the same sound presented are separated by a sufficiently short time delay, listeners perceive a single auditory event; its perceived spatial location is dominated by the location of the first-arriving sound. The lagging sound does also affect the perceived location; however, its effect is mostly suppressed by the first-arriving sound.

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