The question is about the actual physical setup and steps needed to take in order to experiment with the phenomena. I found a tutorial on jove.com, "How to Create and Use Binocular Rivalry", and it also has a dedicated explanatory article. However, the experiment I want to make is tricky in the following sense:
A regular binocular rivalry experiment has two separate images set up, and normally the image features are controlled in a way that is suitable to exhibit a whatever the experimenters want. In the case that I want to make, images are not separate, they are basically left and right parts of a single image that is usually viewed as a single image as well.
In the experiment, I will manipulate left and right halves of that single image separately, but I want to present halves to different eyes. The particular problem is that I want to calibrate the physical setup so that the physical boundary between images is not exactly visible. I can't just split left and right - the border between the images in the eyes of the observer has to be as small as possible.
How can I present each half of a face, split vertically down the middle, independently to each eye (e.g., left half-left eye), without putting a visible physical boundary between the two image halves?