We examine the visual properties of graphic forms and the role they play in reading within and across writing systems. We argue that writing-system factors determine the complexity of graphic forms, which affects perceptual processes in reading. We review studies we have carried out on graph complexity, including a description of GraphCom, a multidimensional system for quantifying complexity that we applied to 131 orthographies. We suggest that meeting the challenges of complexity leads to increased perceptual skills and report a comparison of the two scripts of Chinese, the most complex among the world’s writing systems. Use of the more complex traditional script is associated with greater perceptual performance compared with the simplified script, lending support to this suggestion.
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