Aoki K, Feldman M W
National Institute of Genetics, Shizuoka-ken, Japan.
Theor Popul Biol. 1989 Apr;35(2):181-94. doi: 10.1016/0040-5809(89)90016-6.
The capacity for spoken language in the human is a genetic trait, but the information communicated by this means is to a large extent culturally determined. Using a gene-culture coevolutionary approach, we model the hypothesis that speech evolved as a channel for the communication of adaptive cultural traits from parent to offspring. The motivation for this paper is a condition obtained previously that initial increase of communication would require at least a two-fold advantage for the transmitted trait. Here, we show that under reasonable assumptions the invasion condition becomes less stringent. In Model 1, we assume that two adaptive cultural traits can be transmitted. A gene which permits communication of the second adaptive trait. In Model 2, we assume that a related function such as greater memory capacity is a prerequisite for speech, and that this function confers an advantage independent of its association with speech. In both models we assume haploid sexual genetics and a simple scheme of vertical transmission. The stability properties of all corner and edge equilibria of the models are analyzed. The two models taken together suggest a possible scenario for the initial stages of the evolution of speech.
人类的口语能力是一种遗传特征，但通过这种方式传递的信息在很大程度上是由文化决定的。我们采用基因 - 文化共同进化的方法，对言语作为适应性文化特征从亲代传递给子代的交流渠道而进化的这一假设进行建模。本文的动机源于先前得到的一个条件，即交流的初始增加要求传递的特征至少具有两倍的优势。在这里，我们表明，在合理的假设下，入侵条件变得不那么严格。在模型1中，我们假设可以传递两种适应性文化特征。一个允许传递第二种适应性特征的基因。在模型2中，我们假设诸如更大的记忆容量等相关功能是言语的先决条件，并且该功能赋予一种独立于其与言语关联的优势。在两个模型中，我们都假设单倍体有性遗传学和简单的垂直传递方案。分析了模型所有角点和边缘平衡点的稳定性特性。这两个模型共同表明了言语进化初始阶段的一种可能情形。
