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(a) Our custom-built binocular eye tracker with two infrared cameras and LED array below them. (b) Our eye tracker set-up consisting of the eye tracker by itself, the gaming computer, the computer screen, and a chin rest. Note that for studies on binocular interactions, we are primarily interested in eye movements within a range of approximately +/- 5 deg from the center of the screen; thus, occlusion of part of the screen by our eye tracker cameras is not problematic.
