What is the precedence effect? How was it studied by Wallach, Newman, and Rosenz

Question

What is the precedence effect? How was it studied by Wallach, Newman, and Rosenzweig (1949)? Describe the procedure used by Stellmack et al. (1999) to derive source and echo weights. What did they learn about the influence of source as the echo delay was lengthened from 1-256 ms for conditions in which judgments were to be based on echo interaural differences of time? What did they learn about the influence of the echo as the echo delay was lengthened from 1-256 ms for conditions in which judgments were to be based on source interaural differences of time? What did they learn about the relative difficulty of judging leading and lagging events as echo delays were lengthened beyond 8 ms?

Explanation / Answer

Precendence effect is a psychoacoustic phenomenon whereby an acoustic signal arriving first at ears suppresses the ability to hear any other signals.

The precedence effect has been studied extensively with pairs of clicks(one leading and one lagging), the precedence effect is strongest when the leading click precedes the lagging click by 1 to 5 ms and then rapidly becomes weaker.

Stellmack et al.(1999) used three pulse stimuli in which judgement were to be based on the first, second or third. He best performence based on the first when the intervel between the first and second pulse was less that 10ms and the best performence based on the third when the intervel between the second and third pulse exceeded 10ms.

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