Comment by ChrisMarshallNY

This is pretty much the same way that a calibrator works (if you have ever watched a color calibrator running, you know what I mean), but a calibrator doesn't get biased, like the human eye.

In order for it to be a true "neutral" test, each test would need to be preceded by a "palate-cleanser" gray screen, or something, and there would probably need to be a neutral border.

> you should be shown all hues at once and asked to position a cut-off point.

This is actually the way I have seen this stuff tested, before.