The role of genetic and environmental factors in modulating the development of brain lateralization is far from being fully understood, and the presence of individual differences in several lateralized functions is still an open question. In goldbelly topminnows, the genetic basis of asymmetrical functions in the brain has been studied, and recently it has been found that light stimulation influences the expression of lateralization of newborns. Here, we investigated whether prenatal exposure to predators affects the development of lateralization in 10-day-old topminnows born from females exposed to a real or to a simulated predator during pregnancy. Offspring from females exposed to a real predator were lateralized in both visual and motor tests, whereas fish from females exposed to a simulated predator were not and did not differ from controls. Prenatal exposure to a real predator might promote the alignment of lateralization in the same direction in different individuals.

中文翻译：

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产前对捕食者的视觉暴露影响金腹鲦鱼的侧向化

遗传和环境因素在调节大脑侧化发展中的作用远未完全了解，几种侧化功能存在个体差异仍然是一个悬而未决的问题。在金腹鲦鱼中，研究了大脑不对称功能的遗传基础，最近发现光刺激会影响新生儿侧化的表达。在这里，我们调查了产前暴露于捕食者是否会影响在怀孕期间暴露于真实或模拟捕食者的雌性所生的 10 天大顶级鲦鱼的侧化发展。暴露于真实捕食者的雌性的后代在视觉和运动测试中都被侧向化，而暴露于模拟捕食者的雌性的鱼与对照组没有也没有不同。