This is very interesting!
I recently did a listening test with 20 participants on different bouncing methods. 15 of them claimed to hear difference between four versions. When I later did a inverted-null test, i found out all four versions were identical. I might have done something wrong along the way, but right now I'm more interested in the placebo-aspect of it.
I am presenting the test to my class (i am a student) in two days, and I'm wondering if anyone knows if there has been any research on this subject?
Would be nice to be able to point to some good sources in my presentation