Re: DBT in audio - a protocol

On 13 Jan 2006 11:29:49 -0800, "andy" <andy19191@xxxxxxxxxx> wrote:

>Don Pearce wrote:
>> Sighted testing is of no value whatever.
>
>Many experiments are performed in the presence of bias. So long as this
>bias can be quantified it can be backed out albeit at the expense of
>more samples for a given level of confidence. To do this for your
>example cable test would require the subject to see cable A connected
>but hear sound from either cable A or cable B and similarly for cable
>B. Difficult to arrange but not impossible.
>
>However, the main reason I suggested a sighted test is that I strongly
>suspect the results from another blind test is not going to make one
>iota of difference to anyones viewpoint. The results from a sighted
>test might, although I would not put any money on it, and would at
>least be a bit more interesting to discuss.

So I make the test sighted, and the subject scores 100%, saying of
course they sound different. How do I factor that out of the
experiment?

I repeat. Sighted tests are valueless.

d

Pearce Consulting
http://www.pearce.uk.com
.

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