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RE: Let me get this out of my system...

AB=you compare A en B and you know that you are listening to A or B
ABX= you listen to A, you listen to B and now a third party (might be Foobar ABX comparator) randomly plays A or B. You score without knowing if it is A or B playing.
After 10 or so trials you compare your score with the real score and check if you are above change level.

Compared with DBT this is probably SBT

What is the procedural merit of an experimenter not knowing what he/she is doing?

None of course, in all experiments the experimenter makes the design, the experimental setup and is supposed to know what he is doing.
In DBT, the experimenter knows, the participants and the raters (often patients and doctors) don’t.
A proper conducted ABX is in essence a unsighted test. Of course the results are not conclusive, it claims just one but not unimportant thing, removing the bias from the experiment.
It says nothing about the conditions (program material, gear, room, etc)


The Well Tempered Computer

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