THE EMERGENCE OF COLLECTIVE MEMORIES Sungmin Lee 李圣民 (Umeå University 于默奥学 , 瑞典 )Verónica Ramenzoni (MPI Psycholinguistics Nijmegen, Holland)Petter Holme 郝培德 (Umeå University 于默奥学 , 瑞典 , Sungkyunguan University 成韵馆学,韩国 )PLoS ONE 5, e12522 (2010).http://www.tp.umu.se/~holme/全国复杂络学术会议 October 17, 2010
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THE EMERGENCE OF COLLECTIVE MEMORIES Sungmin Lee 李圣民 (Umeå University 于默奥⼤大学, 瑞典) Verónica Ramenzoni (MPI Psycholinguistics Nijmegen, Holland) Petter Holme 郝培德 (Umeå University 于默奥⼤大学, 瑞典, Sungkyunguan University 成韵馆⼤大学,韩国) PLoS ONE 5, e12522 (2010).
http://www.tp.umu.se/~holme/
全国复杂⺴⽹网络学术会议 October 17, 2010
培德在苏州
complex network boom of early 00’s
Narrative network 叙述⺴⽹网络 ≈ Memory web 记忆⺴⽹网络
research leader fieldtrip to 北京
Outline
- What is the topology of real narrative networks?
- How can we model the evolution of narrative networks / memory webs?
- How (much) can communication stabilize collective memories?
- What are the conditions for groups to form?
- How does the observations behave as a function of population size?
Empirical memory webSource material
Bearman, Moody, Faris, 2003. “Networks and History” Complexity 8:61–71.
Empirical memory webIndividual memory web 1
Bearman, Moody, Faris, 2003. “Networks and History” Complexity 8:61–71.
Empirical memory webIndividual memory web 2
Bearman, Moody, Faris, 2003. “Networks and History” Complexity 8:61–71.
Empirical memory webAggregate memory web
Bearman, Moody, Faris, 2003. “Networks and History” Complexity 8:61–71.
Empirical memory webDegree distribution
Empirical memory webClustering coefficient vs. degree
Empirical memory webDegree correlations
Empirical memory webCommunity structure
Model ingredients
- N agents with individual memory webs.
- Agents can learn about history from experience or communication.
- Closer friends are more likely to communicate & people who communicate often are closer friends.
- Events / associative arcs remembered more strongly are more frequently discussed, and vice versa.
- Events / associative arcs not talked about are gradually forgotten.
Communication modelLearning dynamics
Example outputMemory overlap
15
Community structure dynamicsNumber of groups
Model community structureNumber of groups
Model community structureMemories and social ties
18
Model community structureSize- & communication-rate scaling of the number of communities
Model community structureSize-scaling of the diversity regime
Model community structureSize-scaling of the diversity regime
Model community structureSize-scaling of the number of groups
Summary - Narrative networks represent memory webs. - Network modeling can be helpful to understand these quantitatively. - An empirical narrative network shows skewed (in- and out-) degree distribution. - Propose a communication model that shows the emergence of collective memories - … and the formation of communities with strong internal connections and similar memory webs. - The number of communities is limited as a function of N