Human Visual Ecology and Orientation Anisotropies in Acuity

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 horizontal...

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Bibliographic Details
Published in:Science
Main Authors: Annis, Robert C., Frost, Barrie
Format: Article in Journal/Newspaper
Language:English
Published: American Association for the Advancement of Science (AAAS) 1973
Subjects:
Indian
Cree indians
James Bay
Online Access:http://dx.doi.org/10.1126/science.182.4113.729
https://www.science.org/doi/pdf/10.1126/science.182.4113.729
Description
Summary: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.

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