Re: DBT in audio - a protocol

Don Pearce wrote:
> No, please try again. I really didn't understand how sighted bias
> could be factored out of this situation.

Consider an experiment where the subject sees the 4 pairs:

A B, A B, A B, A B

but actually hears the 4 pairs:

A B, B A, A A, B B

If the subject claims to hear (D=different and S=same):

D D D D then 100% correlated with sight and 0% corrleated with
sound

D D S S then 0% correlated with sight and 100% correlated with
sound

S S S S then 0% correlated with sight and 0% correlated with
sound

The first indicates the subject is biased by sight and cannot tell from
the sound, the second indicates the subject is not biased by sight and
can tell from the sound and the third is not biased by sight but cannot
tell from the sound.

Obviously one needs to take more samples to get a reasonable level of
confidence in the results. The required number of samples will also be
signficantly more than that required with blind testing for the same
level of confidence.

As presented, the experiment is also almost certainly too naive to get
accepted by most subjects. Complexity will need to be added.
Nonetheless, hopefully, the principle is clear.

A completely different approach for sighted testing could be to
determine the difference between the two cables and create a modified
copy of the source so that when played back using one of the cables it
produces an identical acoustic output (way within what is discernible
in the room) to that produced using the other cable. This is unlikely
to be particularly difficult and can be checked with a microphone since
the room response is not going to be a problem. This would avoid having
to visually deceive the subject and still allow the subject to hear
either identical sounds or sounds which differ by the properties of the
cables. Note that the task of the subject is still the same: to hear an
unprocessed difference.

.

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