In unison: First- and second-order information combine for integration of shape information

Ken W. S. Tan, J. Edwin Dickinson, David R. Badcock

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The modulation of orientation around radial frequency (RF) patterns and RF textures is globally processed in both cases. This psychophysical study investigates whether the combination-a textured RF path obtained by applying an RF texture to an RF contour-is processed like a texture or a contour when making judgements about shape. Unlike RF textures, the impression of a closed flow was not required for global integration of textured RF paths, suggesting that these paths were processed as second-order, or contrast-defined contours. Luminance-defined (LD) RF paths were shown to globally integrate but with thresholds approximately half of those for the proposed second-order textured paths. The next experiment investigated whether this benefit was due to LD stimuli possessing double the amount of information (first- and second-order information). A mixed three-part contour composed of two different second-order texture components and an LD component was then employed to determine how the different cues combined. The mixed path thresholds matched predictions derived from a linear combination of firstand second-order cues. The conclusion is that the shape of isolated contours is processed using both first- and second-order information equally and that the contribution of texture is to carry additional secondorder signal.
Original languageEnglish
Article number9
Pages (from-to)1-14
JournalJournal of Vision
Issue number11
Publication statusPublished - Sept 2016


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