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Re: We may be refering to the same study.

The authors distinguish between results obtained by objective measurements and results obtained by asking patients how the feel. So you can't just lump the two together. This is in the realm of medicine.

The objective results do not seem to be subject to placebo effects. How the patients feel or report they feel is subject to placebo effects but perhaps less than has been assumed.

Sighted auditions, which is not medicine, are subject to bias, more so as the differences approach threshold, if I understand jj correctly.

Floyd Toole discusses sighted bias affecting the evaluation of speakers (which really do sound different) in one of his white papers on the Harman International site.

http://www.harman.com/wp/pdf/AudioScience.pdf

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