A different set of research findings helps to explain the radiologists’ results. When we’re engaged in physical activity, our visual sense is sharpened, especially with regard to stimuli appearing in the periphery of our gaze. This shift, which is also found in non-human animals, makes evolutionary sense: the visual system becomes more sensitive when we are actively exploring our environment. When our bodies are at rest—that is, sitting still in a chair—this heightened acuity is dialed down.
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