这种群体内部的偏侧性不平衡对个体也有好处。
This imbalance of lateralization within populations may also have advantages for individuals.
罗杰斯发现，小鸡的偏侧性取决于它在孵出蛋之前是否暴露在阳光下——如果在这段时间里保持黑暗，右脑或左脑都不会占优势。
Rogers found that a chick's lateralisation depends on whether it is exposed to light before hatching from its egg—if it is kept in the dark during this period, neither hemisphere becomes dominant.
与此同时，在鸣禽和老鼠身上也发现了类似的证据，从那时起，研究人员已经建立了一个令人印象深刻的动物偏侧性目录。
Similar evidence appeared in songbirds and rats around the same time, and since then, researchers have built up an impressive catalogue of animal lateralisation.
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