Journal
VISION RESEARCH
Volume 41, Issue 14, Pages 1749-1753Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0042-6989(01)00089-X
Keywords
inverse oblique effect; oblique orientations; contrast detection thresholds
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Funding
- NEI NIH HHS [EY02158] Funding Source: Medline
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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). Moire 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. (C) 2001 Elsevier Science Ltd. All rights reserved.
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