Proof of placebo effect ?

[okiemax]

Any such experiment is easy to conduct. One just switches the same component for the listener to listen for differences, Only A is listened to in all the trials without telling the listener, of course. 75% of participants will hear differences from the same component presented.
The link doesn't seem to work; it takes you to an ad?

Try a Google search using the following term: minnesota dunlavy wire. Go to the first item found by the search. What you will see is the Feb. 1997 ASM Bulletin with the Dunlavy article. I just tried it again, and it worked. I didn't get an ad.

Yes, I think you are right about how such tests are conducted, but what I am curious about is what were the participants told going into the test.