Sorry Andrew Everard to bore you with another of my interminable posts. I have put a spell checker through this post and my previous posts on the thread. But I expect that some hilarity will remain, due to words so misspelled they are actually other words with completely different meaning.
Craig M.:i assume then that the sceptics are saying it's expectation bias that explains believers hearing differences? wouldn't that apply the other way as well, if you expect no difference you hear no difference? my own recent experience makes me think it might, after changing my interconnects for some a shop gave me to demo, i sat down to listen thinking there would be no audible difference - i'd read enough forum threads to make me think this would be quite likely - and lo and behold, no apparent difference. it was only when i'd decided i'd put that one to bed, and put my own interconnect back in that i noticed a definite difference. i wasn't listening out for it, but it was quite obvious.
Yes it works both ways. If a cable believer invited a group of cable skeptics around to demonstrate how his cables improved sound quality, and the change of cable or something done covertly at the same time created a measurable, and according to psycho acoustics easily discernable difference. The expected result would be that despite repeatedly swapping the cables and pointing out the difference, they would be adamant they could not hear any difference. On revealing the ruse this could then be used as evidence that the skeptics are either too deaf or too close minded to benefit from any improvements offered by a cable.
Expectation of being able to hear change, making you hear the change because auditory perception is subconsciously focused steered , works even when you are aware of how unreliable perception is. The apocryphal tales of the sound engineer spending hours finely adjusting the sound to perfection, only to discover the device was not connected to the sound path. The A/B comparison test to things the listener knows should make an audible difference, that they are adamant they can hear and enthusiastically describe the difference, only to discover that they have been listening to A the whole time.
The effect is so great that even when the listener is fully aware of the ruse it is difficult to impossible to not perceive if expectation is great, like with human speech. The recording of speech altered to remove the pronunciation of certain letters. Even when the person is fully aware that the recording and playback does not contain the pronunciation of the letters they have great difficulty in not hearing them being pronounced. The listen to a piece of music and tell me what you hear them say, where you can hardly make out a word. The identical piece of music repeated with subtitles and the ease with which the words are now heard, that remains even when the music is repeated a third time without subtitles.