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arXiv physics/0701333physics.soc-phnlin.AO
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地方趋同与全球多样性:文化同质性的鲁棒性

Local Convergence and Global Diversity: The Robustness of Cultural Homophily

Andreas Flache, Michael W. Macy

摘要:

最近对文化传播的阿克塞尔罗德模型(Klemm et al 2003)的扩展表明,全球多样性是极其脆弱的,只有少量的文化突变。这似乎破坏了原来的阿克塞尔罗德理论,同质性保护多样性。我们表明,文化多样性是令人惊讶的强大,如果我们增加的倾向,同质性如下。首先,我们提高了相似性的门槛,低于这个门槛就排除了影响。其次,我们允许代理同时受到所有邻居的影响,而不是像原始模型中假设的那样只有一个邻居。计算实验表明,这两种修改强烈增加的多样性对突变的鲁棒性。我们还发现,我们的扩展可能会扭转Axelrod的主要结果之一。虽然阿克塞尔罗德预测,更多的文化维度(功能)减少多样性,我们发现,更多的功能可能会带来更高水平的多样性。

英文摘要:

Recent extensions of the Axelrod model of cultural dissemination (Klemm et al 2003) showed that global diversity is extremely fragile with small amounts of cultural mutation. This seemed to undermine the original Axelrod theory that homophily preserves diversity. We show that cultural diversity is surprisingly robust if we increase the tendency towards homophily as follows. First, we raised the threshold of similarity below which influence is precluded. Second, we allowed agents to be influenced by all neighbors simultaneously, instead of only one neighbor as assumed in the orginal model. Computational experiments show how both modifications strongly increase the robustness of diversity against mutation. We also find that our extensions may reverse at least one of the main results of Axelrod. While Axelrod predicted that a larger number of cultural dimensions (features) reduces diversity, we find that more features may entail higher levels of diversity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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