Shape and Contour—Dots and Dashes
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Shape and contour—dots and dashes There seems to be a fundamental disagreement between the observations of Attneave (1954) about the nature of points at which information is concentrated and Kennedy and Domander's (1985) definition of these points. Attneave refers to points 'where a contour changes direction' and contrasts these with points elsewhere on a contour where no such changes take place. Note that he refers to points, that is to spatial entities which, ideally, are infinitely small, but which are commonly represented by little dots, figures of small size and having a shape which does not suggest direction; figures which convey only position in space but are otherwise inert. In their investigation Kennedy and Domander use short dashes and not dots. Dashes do imply direction, an element excluded from Attneave's considerations, and do not therefore offer an unbiased means for questioning Attneave's notions.
[1] John M Kennedy,et al. Shape and Contour: The Points of Maximum Change are Least Useful for Recognition , 1985, Perception.
[2] F. Attneave. Some informational aspects of visual perception. , 1954, Psychological review.