Opinion Polarization by Learning from Social Feedback
Sven Banisch & Eckehard Olbrich MPI for Mathematics in the Sciences (Leipzig)
Opinion Dynamics and Collective Decision, Bremen 2017 H2020 – FETPROACT-2016 - 732942
Opinion Dynamics and Cultural Confict odycceus.eu in European Spaces
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A controversy, most on which final decisions are based. Importantly, often, involves a series the weights assigned to of issues that are logicOver the course of a the different issues as across the participants ally and cognitivelydiscourse not all the Over the course of a issues playing a role are discourse not all the well as the understanding and this has important
linked. onarguments a
about their mutual onarguments a
visible from the very issues playing a role are consequences for the onarguments a A proper spatial relatedness differ beginning. New issues visible from the very process of finding For a debate to be fruitful the emergence of representation of such multi-dimensionality multi-dimensionalitymay arise, first-time beginning. New issues compromise. a common understanding complexity should and interconnectedness multi-dimensionality may arise, first-time A controversy, most In a prolonged debate of the structure of the points at stake. and interconnectedness andissues interconnectedness may cease to be multi-dimensionality underlying a controversy of the points at stake. therefore take into and interconnectedness central, and sometimes issues may cease to be often, involves a series the importance of and We propose to model of the points at stake. multi-dimensionality is necessary. and interconnectedness of the points at stake. this by a network the We propose to model of the points at stake. account the this by a network the We propose to model very few controverse central, and sometimes relations between the nodes of which are key We propose to model of issues that are logic nodes of which are key this by a network the issues in a debate and this by a network the issues in a debate and nodes of which are key nodes of which are key points turn out and very few controverse dimensions of it are issues in a debate and issues in a debate and the links weights for the links weights for ally and cognitively the links weights for the links weights for We propose to model relations in between relations in between relations in between become the key issues points turn out and subject to cognitive relations in between those. linked. those. those. those. this by a network the become the key issues negotiations as well. nodes of which are key A proper spatial issues in a debate and representation of such the links weights for complexity should relations in between therefore take into those. account the Polarization: an important but also controversial issue Te Puzzle of Polarization
» If people tend to become alike in their beliefs, attitudes, and behavior when they interact, why do not all such diferences eventually disappear? « (Axelrod, 1997) » Since universal ultimate agreement is an ubiquitous outcome of a very broad class of mathematical models, we are naturally led to inquire what on earth one must assume in order to gene- rate the bimodal outcome of community cleavage studies. « (Abelson, 1964) ▶ Tese questions have inspired a lot of modelling work throug- hout decades: the feld is now known as Opinion Dynamics Terminology tćFUFSNx1PMBSJ[BUJPOjJTVTFEEJČFSFOUMZJOEJČFSFOUĕFMET t*O(SPVQ1TZDIPMPHZJUNBJOMZSFGFSTUPBQSPDFTTCZXIJDIEFMJ- CFSBUJOHHSPVQTCFDPNFNPSFFYUSFNF ŕ5BLFOVQJO1PMJUJDBM4DJFODF 4VOTUFJOATxMBXPGHSPVQQPMBSJ[BUJPOj) t*O4PDJPMPHZmainlyBQSPDFTTCZXIJDITUSPOHEJWFSHFODFTPGQPMJ- UJDBMPQJOJPOTDPNFBCPVUBOEBNFBTVSFPGUIFFYUFOEUPXIJDIB DFSUBJOEJTUSJCVUJPOPGPQJOJPOTJTQPMBSJ[FE ŕ%J.BHHJPFUBMEJČFSFOUJBUFBTQFDUT t*O0QJOJPO%ZOBNJDTCPUIOPUJPOTTPNFUJNFTBEPQUFE QIZTJDT NPEFMTWTTPDJPMPHJDBMNPEFMT "MTPPQJOJPOQMVSBMJUZPSDPFYJTUFODF Mechanisms t1PTJUJWFTPDJBMJOĘVFODFPQJOJPOTUFOEUPBMJHOJOJOUFSBDUJPO t7BMVFIPNPQIJMZBHFOUTXJUITJNJMBSPQJOJPOTJOUFSBDUNPSF GSFRVFOUMZ t4UBUVTIPNPQIJMZTPDJPEFNPHSBQIJDBMMZTJNJMBSBHFOUTJOUFS BDUNPSFGSFRVFOUMZ t/FHBUJWFTPDJBMJOĘVFODFBHFOUTXJUIWFSZEJČFSFOUWJFXT BEPQUFWFONPSFEJTUBOUQPTJUJPOTJOUIFPQJOJPOTQBDF t"SHVNFOUQFSTVBTJPOMFBSOJOHOFXTVQQPSUJWFBSHVNFOUT CJBTFEBTTJNJMBUJPOJOGBWPVSPGTVQQPSUJWFWJFXT Mechanisms → Outcomes t1PTJUJWFsocial infuence + status homophily → consensus (static networks, traditional models, binary models) t1PTJUJWFsocial infuence + opinion homophily → plurality with MPDBMBWFSBHJOH "YFMSPE CPVOEFEDPOĕEFODF DPFWPMWJOHOFUXPSLT tPositive + negativ social infuence → polarization (Bourdieu: cultural/aesthetic diferentiation) t1PTJUJWF OFHBUJWinfuence + opinion homophily → consensus tArgument persuasion + opinion homophily → polarization tBiased assimilation + opinion homophily → polarization Polarization Dynamics by Learning Q( ) Q( ) from Social Feedback t Social feedback + status homophily → polarization t"HFOUTDBOFYQSFTTUXPEJČFSFOUPQJOJPOT or XJUIJOUIFJS social neighborhood t0OFYQSFTTJOHUIFJSDVSSFOUPQJOJPOBHFOUTSFDFJWFBďSNBUJWF or non-confrming response depending on the current opinion in the neighborhood t"HSFFNFOUMFBETUPBQPTJUJWFFYQFSJFODFXIJDITUSFOHUIFOT TVQQPSUPOUIFFYQSFTTFEPQJOJPO Rooted in Reinforcement Learning Q( ) Q( ) t0QJOJPOFYQSFTTJPOBTBDUJPO t"HFOUTMFBSOWBMVFT2 P PGBDUJPOTCBTFEPOSFXBSE XIJDINBZ NPEFMEJČFSFOULJOETTPDJBMGFFECBDL t'PSOPXBHSFFNFOU→S]EJTBHSFFNFOU→ r = -1
3BOEPNBHFOUFYQSFTTFTPiBSHNBY2i P џHSFFEZ o 3BOEPNOFJHICPSSFTQPOETPj
3FXBSESi = oi oj DPEJOH = 1 = -1 4. Micro- and Macrodynamics Q( ) Q( ) ▶ Selected individual trajectories (spatial random graph)
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