Propeller Head Plaza

Technical and scientific discussion of amps, cables and other topics.

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Re: But that doesnâ€™t explain why prior knowledge is required

Posted by jneutron on April 5, 2006 at 10:51:47:
My guess..
Every time I read about someone who pulls a fast one like not swapping something, or changing things but fast, and forcing decisions rapidly, are they closing the decision window before the testee has gone through the acclimation time frame?
Yes, expectation bias must be considered, but that does not necessarily rule out the error of the test method.
When I use a DVM to take a reading, I always try to work within the capabilities of the machine. It does not give accurate readings if I do not maintain electrical contact long enough for the meter to read it.
Sound image generation via the use of entirely artificial stimulus patterns, forces the brain to re-configure.
Consider an optical analogy. Take your glasses, and rotate them quickly while on, clockwise or ccw, no matter. When you do this, you'll see that the image you look at quickly follows the rotation of the glasses..but slowly, your eye muscles adapt to this, making the image coalesce. You've adapted to the variation of stimulus. But, it's an optical stimulus which does not exist in nature normally. Takes my eyes about half a second to adapt. But after an hour or so of this messed up stimulus, I'll have a headache..so, if I have three sets of glasses, one skewed cw, one skewed ccw, and one normal, and keep switching back and forth confusing my eyes all to hell...I will not be able to tell quickly which is the correct one..it will take an hour or so to be able to say good or bad.
The main thing is there is a time constant to adaptation.
Our hearing is the same. It's adapts to the overall loudness of the content..and it adapts to the changes in localization mapping. But nobody has really done the research to figure it out.
Cheers, John