A. Overt Versus Covert Visual Attention Due to the much higher resolution in the center of the retina compared to its more peripheral regions, humans and other primates usually direct their center of gaze toward the most relevant areas of the visual scene. This generates a series of fixations (and smooth eye movements, although the latter are not often discussed in the context of selective attention) called ‘‘overt attention,’’ since allocation of the high-resolution resources in the fovea can be easily observed by following the person’s eyes, most conveniently and quantifiably with an eye tracker. It has been proposed that far-reaching conclusions can be drawn about the state of the human mind by analyzing the details of this so-called ‘‘scan path’’ [14], [15].