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Objects in the natural world possess different visual attributes, including shape, colour, surface texture and motion. Previous perceptual studies have assumed that the brain analyses the colour of a surface independently of its three-dimensional shape and viewing geometry, although there are neural connections between colour and two-dimensional form… (More)
re¯ectance and the objective assessment of avian sexual dichromatism. Morphology of UV re¯ectance in a whistling-thrush: implications for the study of structural colour signalling in birds. that offspring sex ratio varies with maternal condition.