Understanding conscious visual processing is a challenging problem in vision science. Recently we have developed an experimental paradigm to study conscious selection of bi-stable percepts in stereoscopic vision. The paradigm exploits a visual stimulus in which we independently manipulated two signals that our brain uses to retrieve the 3D layout of a scene. One of the signals was binocular disparity (i.e. according to the geometry of vision with two frontal eyes) and the other was monocular perspective. A novel feature of the paradigm is that our observers were able to attentively select one of two alternative percepts at will in a well-controlled way. Our paradigm provides therefore an ideal tool to study conscious vision psychophysically and physiologically through fMRI. In this project we attempt to learn about underlying mechanisms that play a role in conscious visual processing by means of the use of combined psychophysical and fMRI methods (and possibly other techniques like ERP).