How similarity shapes diagrams

  • Authors:
  • Merideth Gattis

  • Affiliations:
  • Department of Psychology, University of Sheffield, Sheffield, UK

  • Venue:
  • Spatial cognition III
  • Year:
  • 2003

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Abstract

Most diagrams communicate effectively despite the fact that diagrams as a group have a minium of conventions and a high tolerance for novelty. This paper proposes that the diversity and felicity of diagrammatic representation is based on three kinds of similarity between semantic propositions and spatial representations that allow people to interpret diagrams consistently with a minimum of effort and training. Iconicity is similarity of physical appearance, polarity is similarity in the positive and negative structure of dimensions, and relational similarity aligns structures so that elements correspond to elements, relations correspond to relations, and so on. In diagrammatic reasoning detected similarities are used to create correspondences between the visual characteristics of a diagram and its semantic meaning, and those correspondences are in turn used to make inferences about unknown or underspecified meanings.