Spontaneous emergence of contrarian-like behaviour in an opinion   spreading model
  We introduce stochastic driving in the Sznajd model of opinion spreading. This stochastic effect is meant to mimic a social temperature, so that agents can take random decisions with a varying probability. We show that a stochastic driving has a tremendous impact on the system dynamics as a whole by inducing an order-disorder nonequilibrium phase transition. Interestingly, under certain conditions, this stochastic dynamics can spontaneously lead to agents in the system who are analogous to Galam's contarians. 
Marta S. de la Lama, Juan M. Lopez and Horacio S. Wio (Instituto de   Fisica de Cantabria)