Individual differences in laterality and personality are expected to covary, as emotions are processed differently by the two hemispheres and personality involves emotional behavior. Fish species are often used to investigate this topic due to the large variability in personality and laterality patterns. While some species show a positive relationship between lateralization strength and boldness, others show a negative relationship, and some show no relationship. A new way to assess the robustness of such relationship is to manipulate both laterality and personality to examine how this affects their relationship. To this end, we conducted a fully factorial design experiment manipulating predation and group size during early development. Results showed that the strength of laterality was influenced by predation threat, while social tendency and boldness were influenced by group size. These findings suggest that early life conditions can have an impact on laterality and social behavior. The relationship between laterality and personality traits, while present, was heavily influenced by the specific trial conditions, but not by the different developmental conditions. In summary, the relationship between laterality and behaviors appears to be context-dependent, yet resilient to early environmental manipulations.

中文翻译：

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早期捕食和社会线索对偏侧性和人格之间关系的影响

偏侧性和个性的个体差异预计会共存，因为两个半球处理情绪的方式不同，而个性涉及情绪行为。由于鱼类的个性和偏侧性模式差异很大，因此经常使用鱼类来研究这一主题。虽然有些物种在偏侧化强度和胆量之间表现出正相关关系，但其他物种则显示出负相关关系，还有一些则没有关系。评估这种关系的稳健性的一种新方法是操纵偏侧性和个性来检查这如何影响他们的关系。为此，我们进行了一项全因子设计实验，在早期开发过程中操纵捕食和群体规模。结果表明，偏侧性的强度受到捕食威胁的影响，而社会倾向和大胆性则受到群体规模的影响。这些发现表明，早期生活条件会对偏侧性和社会行为产生影响。偏侧性和人格特质之间的关系虽然存在，但很大程度上受到特定试验条件的影响，但不受不同发展条件的影响。总之，侧向性和行为之间的关系似乎依赖于环境，但对早期环境操纵具有弹性。