I participated in such a test a decade ago but it was 3 drinks: Coke, Pepsi and brand X. Brand X was a new company like a Presidents choice...the Cola product for cheaper. They asked which was which to see if I could tell the difference and then asked which I liked best. I could tell the difference between each of them and could name coke and pepsi with ease. I'd be surprised if you couldn't as neither tastes remotely alike IMO. When i drank Coke my teeth would get gritty when grinding them. Presumably woman should do better than men in these tests because they have a heightened sense of smell. And smell is a part of the tasting process.

I found the brain measurements extremely interesting. I would like to see such a test in audio DBTs. Listening to music in a non testing enviroment versus same person's scan in the testing environment and the decision factors. In fact with today's technology this should be used. Too bad psychologists who should be the beacon of validity are not the ones running the tests - instead we have non scientific hacks claled engineers doing it - oh well