Abstract
Using readily available equipment, we assembled a digital graphics system to investigate several facets of how the human visual system gathers information. Of particular interest is the relationship and interaction between central and peripheral visual processes, investigated by selectively prohibiting foveal or peripheral visual access to pertinent details in a display. This process requires realtime display modification in response to eye movements and is accomplished by utilizing the capabilities of a graphics array processor to manipulate the 512 x 512 x 8 bit images at TV line rates. An infra-red limbus reflection technique is used to track the observer's gaze. Our applications involved radiologists looking at x-ray images of the human chest. We describe both hardware and software aspects of our interactive visual display system and mention its applications in our laboratory.
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