title: A psychophysical study of apparent rarefaction.
abstract: Five psychophysical functions for visual density are obtained with the use of the magnitude-estimation method. Because of apparent rarefaction, a different psychophysical function ensues for each size of square used. It is found that apparent rarefaction is barely barely detectable for sides longer than 10-15 cm (6-9 deg). It is also found that apparent rarefaction occurs to the greatest extent when short interlinear spacings are used.
mesh_terms: D005556:Form Perception; D006801:Humans; D010364:Pattern Recognition, Visual; D014792:Visual Acuity