Abstract
Age-related changes over the first 8 days of life in the intensity of fear response which is evoked in domestic chicks by a standard visual stimulus follow the same course in male chicks using the right eye and in female chicks using the right or left eye. Changes in left-eyed male chicks follow an entirely different course. Tests involving visual discrimination and habituation confirm the specialization of the (right-sided) neural structures fed by the left eye in males. This pattern of sex difference is formally comparable with the specialization of the right hemisphere in boys described by Witelson ( Science 193, 425–427, 1976).
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