Simultaneous rating of positivity and negativity

[bstewart]

I’m having participants rate pictures that vary on their degree of negativity and positivity, and I was interested in their simultaneous ratings of positivity and negativity. To complete the simultaneous rating, I would like the participants to position a cursor onto a bivariate display (5x5 unit grid) with one dimension (horizontal) indicating positivity and the other negativity. I have not found a way to do this type of rating within MediaLab or DirectRT, and was wondering if it was possible?