Critical size of ego communication networks

Qing Wang, Jian Gao, Tao Zhou, Zheng Hu, Hui Tian

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


With the help of information and communication technologies, studies on the overall social networks have been extensively reported recently. However, investigations on the directed Ego Communication Networks (ECNs) remain insufficient, where an ECN stands for a sub network composed of a centralized individual and his/her direct contacts. In this paper, the directed ECNs are built on the Call Detail Records (CDRs), which cover more than 7 million people of a provincial capital city in China for half a year. Results show that there is a critical size for ECN at about 150, above which the average emotional closeness between ego and alters drops, the balanced relationship between ego and network collapses, and the proportion of strong ties decreases. This paper not only demonstrate the significance of ECN size in affecting its properties, but also shows accordance with the "Dunbar's Number". These results can be viewed as a cross-culture supportive evidence to the well-known Social Brain Hypothesis (SBH).

Original languageEnglish (US)
Article number58004
Issue number5
StatePublished - Jun 2016

ASJC Scopus subject areas

  • General Physics and Astronomy


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