"He then had a group of local racers ride each bike and fill out questionnaires concerning their impressions of frame stiffness and ride qualities. He found that the test group could not correctly identify which bike was different, even though 17 of the 18 riders claimed they could."

Cringing at this - thinking back on my sound mixer days claiming we could hear this or that nuance in this or that sound system. CD vs mp3 double blind anyone? Gradually losing my hearing has been the great equalizer of my hubris. But I can still hear "passing on left" pretty well when I'm on the W&OD trail - and I hear it a lot.