Abstract
Normative data are reported for the visual acuity, luminance-difference threshold and size-difference threshold of pigeons ( Columba livia). The mean visual acuity was 12.66 c/deg or 2.53 min ( N = 54), the mean log luminance-difference threshold was 0.11 ( N = 105) and the mean size-difference threshold was 0.94 mm ( N = 20).
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