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RE: Early reflections: 5 ms time window for sound source localisation?

5 milliseconds is the point at which fusion between the original source and its reflection no longer occurs in a significant number of listeners:

FUSION ECHO THRESHOLDS
Freyman et al. 1991 clicks 5–9 ms lag heard on 50% of trials
Yang and Grantham 1997a clicks 5–10 ms lag clearly audible on 75% of trials
Litovsky et al. 1999 clicks 5–10 ms lag clearly audible on 75% of trials

DISCRIMINATION CRITICAL THRESHOLDS
Freyman et al. 1991 clicks 5–9 ms d851
Yang and Grantham 1997 clicks 5–10 ms discrimination 75% correct
Litovsky et al. 1999 clicks 5–10 ms discrimination 75% correct

LOCALIZATION CRITICAL THRESHOLDS
Litovsky et al. 1997 clicks 11.4 ms lead location chosen on 75% of trials
Litovsky et al. 1997 clicks 8 ms lead location chosen on 75% of trials

http://www.waisman.wisc.edu/~litovsky/papers/1999-3.pdf

As you can see, 5 msecs is a fairly optimistic figure. Better results will be achieved if reflections are suppressed for a longer period.


Edits: 07/13/10 07/13/10
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