Hows this work then?
 

Some sort of mathematical projection or general assumptions on human reactions?

http://trunks.secondfoundation.org/files/psychic.swf

limited number of possible answers. they all have the same symbol. each time you 'try again' they have a new symbol, but are all the same.

also note that other numbers that are not possible will have the same symbol as the possible numbers to mix things up a bit.

-bernie

I can't figure it out.

I guess I'll have to wrap my head in aluminum foil to keep the machine for scanning my brain.

Every possible answer is a multiple of 9. Look at the chart, all the multiples of 9 share the same symbol. (9, 18, 27,36,45...)

When you click "try again", the symbols change, but once again all the multiples of 9 share a common symbol.

exactly. even simpler than a forced-choice questionnaire

...so Moses I can take the aluminum foil off my head now?

yes. all clear ;)