The Neural Control of Vision
P. Ongoing Research

To carry out these experiments, subjects view images through a stereoscope in the magnet. At this stage we examine which brain areas are most active when stereoscopic and motion parallax cues are viewed under maintained fixation conditions. The display is similar to the one shown in Figure 16-1 . We have four stimulus presentation conditions:

(1) the rocking random dot display without any depth cues provided

(2) disparity cues provided

(3) motion parallax cues provided, and

(4) both cues provided.

These procedures allow us to determine

(a) which brain areas play a central role in processing stereopsis,

(b) which areas preferentially process motion parallax,

(c) where these two depth cues are co-processed, and

(d) how the brains of normal and stereo blind subjects differ.