News from the Centre for Policy Modelling, including announcements of: new papers, special issues, books, workshops, projects, jobs and study opportunities.

17 October, 2015

New discussion paper: Culture trumps ethnicity! – Intra-generational cultural evolution and ethnocentrism in an artificial society

Culture trumps ethnicity! – Intra-generational cultural evolution and ethnocentrism in an artificial society

By David Hales and Bruce Edmonds

CPM discussion paper: CPM-15-256

Abstract. Ethnocentrism denotes behaviour and beliefs that are positive towards those who share the same ethnicity and negative towards others. Recent artificial society models have been interpreted as demonstrating how ethnocentrism might evolve under minimal assumptions. In these, evolution is modelled over generations of agents where new agents are born inheriting the ethnicity, behaviours and location of their parents. Behaviour does not change within generations but over many generations and agents only interact with their neighbours. We present a model that considers short-term cultural adaption, where agents may interact with any in a population and do not die or give birth but imitate and innovate their behaviours. While agents have a fixed ethnicity, they have the ability to form and join cultural groups and to change how they define their in-group based on both ethnic and cultural markers (or tags). We find that over a range of parameters cultural identity, rather than ethnocentrism, becomes the dominant way that agents identify their in-group producing high levels of positive interaction both within and between ethnicities. However, in some circumstances, cultural markers of group preference are supplemented by ethnic markers. In other words, whilst pure ethnocentrism (based only on ethnic identity only) is not sustained, groups that discriminate in terms of a combination of cultural and ethnic identities do occur. In these less common cases, high levels of ethnocentric behaviours evolve and persist – even though the ethnic markers are arbitrary and fixed – but they only emerge when combined with culture centric behaviour. Furthermore, cooperative ethnocentric groups do not emerge in the absence of cultural processes. The latter suggests the hypothesis that observed ethnocentrism in observed societies need not be the result of long-term historical processes based upon ethnic markers but could be more dependent upon short run cultural ones. We discuss these results as well as the dangers of over interpretation of models like this.

Paper at:

Model at:

16 October, 2015

Welcome to two Marie-Curie Early Stage Researchers

Lia Aodha and Liz Molina are joining us to study for PhDs under the Marie-Curie SAF21 project (Social Science Aspects of Fisheries for the 21st Century).

Lia will be studying trust in fisheries management using agent-based simulation, and Liz will be looking at how to visualise complex fisheries issues for the general public.

30 September, 2015

Free 2-Day Introduction to Agent-Based Modelling, 3&4 Nov, Manchester

We are re-running this 2-day introduction to agent-based simulation again in Manchester on the 3rd&4th November 2015. This is free but places are limited, so you will need to apply. Priority will be given to early stage researchers and government/voluntary sector analysts.

Details, including how to apply are at:

03 June, 2015

Special Demonstration Session on Policy and Agent-Based Simulation @ ACM SIGSIM PADS, London 11th June

As part of ESSA's attempts to bridge gaps with other fields there will be a special demonstration session at the ACM Simulation SIG on Principles of Advanced Discrete Simulation meeting, that is happening at the University of Westminster, London, June 10-12, 2015.

This special session will showcase ABM policy simulation work, and will happen on the 11th June 2-3.30pm.

The papers will be:

Bridging Relevance with Rigour in the Policy Modelling of Political Participation
Bruce Edmonds (Centre for Policy Modelling, Manchester Metropolitan University, UK), Luis Fernandez Lafuerza (Department of Theoretical Physics, University of Manchester, UK), Louise Dyson (Department of Theoretical Physics, University of Manchester, UK), Laurence Lessard-Phillips (Institute for Social Change, University of Manchester, UK), Ed Fieldhouse (Institute for Social Change, University of Manchester, UK), and Alan McKane (Department of Theoretical Physics, University of Manchester, UK)
Agent-Based Modelling for Exploring Policies in Complex Socio-Environmental Systems
Gary Polhill, Jiaqi Ge, Alessandro Gimona, and Nick Gotts (James Hutton Institute, UK)
Multi-Agent Simulation and Animation with PreSage-2
Jeremy Pitt (Imperial College, UK)

07 February, 2015

Social Simulation 2015 @ Gronigen in the Netherlands

The Eleventh Conference of the European Social Simulation Association

Join us from September 14 to 18 in Groningen (NL)

Deadline for submissions: April 13th 2015

More details:

02 February, 2015

Special Section of JASSS published on "Using Qualitative Evidence to Inform the Specification of Agent-Based Models"

See ( for a more permenant but less nicely formatted link).

The introduction to the issue is:
Edmonds, Bruce (2015) 'Using Qualitative Evidence to Inform the Specification of Agent-Based Models' Journal of Artificial Societies and Social Simulation 18(1):18 <>.
 This is the culmination of the workshops and special sessions of "Social Simulation" (ESSA) conferences on the subject.  Many thanks to all who contributed!