The precedence effect: Revisited

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Abstract
The precedence effect [in humans], as investigated by Wallach et al. was studied in 3 experiments. Experiment 1 was a replication of the original work of Wallach et al. Although the 1st click pair appears to dominate the perception of the position of the lateral image, the effect of the 1st click pair does not appear to offset or cancel the effect of the 2nd click pair in terms of producing a lateral image at midline. The data are consistent with Zurek''s proposal that the binaural system is less sensitive to the interaural temporal difference of the 2nd click pair. Experiment 2 indicated that the effect of the 1st click pair on lateral judgments still dominates that of the 2nd click pair when the images are judged to be off midline. The variability of the data is quite high. Experiment 3 showed that the 1st click pair also led to a larger change in masked thresholds (masking-level differences, MLD) than does the 2nd click pair. The use of 2-click stimuli for demonstrations of the precedence effect and some of the limitations of the procedure and the generalities of the effect were confirmed.

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