Rational Group Decision Making. A random field Ising model at T=0

Details Rational Group Decision Making. A random field Ising model at T=0 Rational Group Decision Making. A random field Ising model at T=0

1997-02-18

arxiv.org/abs/cond-mat/9702163v1

Physica A 238 (1997) 66-80

Physics

Condensed Matter

Disordered Systems and Neural Networks

25 pages, latex

Scientific paper

A modified version of a finite random field Ising ferromagnetic model in an external magnetic field at zero temperature is presented to describe group decision making. Fields may have a non-zero average. A postulate of minimum inter-individual conflicts is assumed. Interactions then produce a group polarization along one very choice which is however randomly selected. A small external social pressure is shown to have a drastic effect on the polarization. Individual bias related to personal backgrounds, cultural values and past experiences are introduced via quenched local competing fields. They are shown to be instrumental in generating a larger spectrum of collective new choices beyond initial ones. In particular, compromise is found to result from the existence of individual competing bias. Conflict is shown to weaken group polarization. The model yields new psycho-sociological insights about consensus and compromise in groups.

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