title: Human visual ecology and orientation anisotropies in acuity.
abstract: The visual environment of Cree Indians from the east coast of James Bay, Quebec, is different from that of city-raised Euro-Canadians. So also are their corresponding orientation anisotropies in visual acuity. A Euro-Canadian sample exhibited the usual higher resolution for vertically and horizontally oriented gratings as compared with oblique orientations, while a Cree Indian sample did not. The most parsimonious explanation of these acuity differences is that orientation-specific detectors in humans are tuned by the early visual environment.
mesh_terms: D003469:Culture; D004777:Environment; D005260:Female; D005556:Form Perception; D006801:Humans; D007198:Indians, North American; D008297:Male; D011792:Quebec; D014792:Visual Acuity; D044465:White People