Abstract
Once a male chicken treated with testosterone begins to respond to a given stimulus, it will persist in responding to that same stimulus for longer than will an untreated chick, and it will be less easily distracted by other perceptual inputs. This persistence has been demonstrated for switching search between two colours of food and in moving from one position of search to another. Naturally circulating levels of androgens will produce this effect. Adult hens were found to be less persistent than cocks. Antiandrogen treatment of cocks decreased persistence so that they behaved like hens. Adult males castrated when 6 days old behaved like hens, and when treated with testosterone their persistence increased to that of untreated adult cocks.
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