Self-regulated exposure to light by pigmented and albino littermates

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Pigmented male rats, heterozygous for the gene allowing expression of color, were crossed with female albinos to produce litters composed of both pigmented and albino pups. Differently pigmented brothers were then reared together in either a dark or a light environment and tested at maturity in a situation allowing the determination of preference functions across intensity of illumination. Pigmented Ss were significantly less light-aversive than albinos, and light-reared Ss less light-aversive than dark-reared. These differences persisted throughout 15 days of testing. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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