Gallup Andrew C, Moscatello Lea, Massen Jorg J M
Psychology Program, Department of Social and Behavioral Sciences, SUNY Polytechnic Institute, Utica, NY, 13502, USA.
Department of Psychology, SUNY College at Oneonta, Oneonta, NY, 13820, USA.
Curr Zool. 2020 Aug;66(4):401-405. doi: 10.1093/cz/zoz060. Epub 2019 Nov 29.
Previous research shows that yawning enhances intracranial circulation and regulates brain temperature. Consistent with these functional outcomes, yawn duration correlates positively with interspecies variation in brain weight across mammals, with robust relationships documented at both the taxonomic rank of class and the more restricted scale of family (e.g., ). This study provides the first investigation into whether differences in brain weight within a single species, domesticated dogs , can predict intraspecific variation in yawn duration. Measures of yawn duration were obtained from public videos available online and then paired with previously published brain and body weight data of different dog breeds. The final sample consisted of 272 yawns from 198 dogs across 23 breeds. Consistent with recent studies, we find robust correlations between yawn duration and brain weight across breeds. Moreover, these correlations remain significant after controlling for differences in body weight across breeds. These findings replicate and extend upon past work in this area and provide further support that yawns evolved to serve an important and large-scale neurophysiologic function.
先前的研究表明，打哈欠可增强颅内血液循环并调节脑温。与这些功能结果一致的是，打哈欠的持续时间与哺乳动物脑重量的种间差异呈正相关，在纲的分类等级以及更狭义的科的层面上均记录到了显著的相关性（例如）。本研究首次探究了单一物种——家犬——的脑重量差异是否能够预测种内打哈欠持续时间的变化。打哈欠持续时间的数据来自在线公开视频，然后与先前发表的不同犬种的脑重和体重数据进行配对。最终样本包括来自23个品种的198只狗的272次打哈欠。与最近的研究一致，我们发现不同品种间打哈欠持续时间与脑重量之间存在显著相关性。此外，在控制了不同品种间体重差异后，这些相关性仍然显著。这些发现重复并扩展了该领域过去的研究工作，并进一步支持了打哈欠进化而来以服务于重要的大规模神经生理功能这一观点。
