I can see how women that have a problem orgasming with someone else and cannot be comfortable enough/in the right mindset would not orgasm. I can maybe see how women that aren't familiar with their own orgasms would miss the signs (well... hmmm). I definitely don't think that happens a lot though. Especially if they haven't been mapping the brainwaves, they can't be sure. Totally depends on the study protocol as well.
Personally, I know my orgasms well. It's definitely not orgasm for me. I think it's the kind of thing TNJ described, something on the way to climax but not there yet by far. It happens about EVERY time though and it's super annoying cause it soaks my bed. <_<
AE, what you described isn't what I can relate to, but that sure sounds awesome also!!