An inverse oblique effect in human vision

Hugh R. Wilson, Gunter Loffler, Frances Wilkinson, William A. Thistlethwaite

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24 Citations (Scopus)
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In the classic oblique effect contrast detection thresholds, orientation discrimination thresholds, and other psychophysical measures are found to be smallest for vertical or horizontal stimuli and significantly higher for stimuli near the +/-45 degrees obliques. Here we report a novel inverse oblique effect in which thresholds for detecting translational structure in random dot patterns [Glass, L. (1969). Moiré effect from random dots. Nature, 223, 578-580] are lowest for obliquely oriented structure and higher for either horizontal or vertical structure. Area summation experiments provide evidence that this results from larger pooling areas for oblique orientations in these patterns. The results can be explained quantitatively by a model for complex cells in which the final filtering stage in a filter-rectify-filter sequence is of significantly larger area for oblique orientations.
Original languageEnglish
Pages (from-to)1749-1753
Number of pages5
JournalVision Research
Issue number14
Early online date7 May 2001
Publication statusPublished - Jun 2001


  • inverse oblique effect
  • contrast detection thresholds
  • oblique orientations


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