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Orientation anisotropy: some caveats in interpreting group differences and developmental changes
Author(s) -
Ross Helen E.
Publication year - 1992
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.1992.tb00293.x
Subject(s) - oblique case , contrast (vision) , anisotropy , sensitivity (control systems) , orientation (vector space) , spatial frequency , optics , physics , audiology , mathematics , geometry , medicine , philosophy , linguistics , electronic engineering , engineering
We tested 220 children aged 7–12 yr and 20 university students for visual contrast sensitivity at spatial frequencies of 1.2 21.9c'deg for vertical, horizontal and oblique sinusoidal gratings. Males had higher menu sensitivity then females and adults had higher mean sensitivity than children‐ Sensitivity was greater for cardinal than oblique orientations, and this oblique effect increased with spatial frequency and mean sensitivity, and with age in children. Developmental growth of oblique anisotropy can be explained by growth in com nisi sensitivity. Different sizes of oblique effect were found between groups living in different locations, hut variations were mainly linked to differences in age and contrast sensitivity. Genetic or environmental interpretations of group differences should be t KM led with caution. Other anisotropies occurred (horizontal was better than vertical and right than left obliquest, but these differences were small and irregular and may represent response biases rather than neurological effects.