Behavioural Decisions in Physarum polycephalum when foraging under risk

John Lee, Universität Bremen, AG Prof. Hans-Günther Döbereiner


Abstract

Both neuronal and non-neuronal organisms live in a complex, heterogeneous environment that requires decision-making, based on constant assessment of information. We present several cases of decision-making processes in Physarum polycephalum, a unicellular slime mould that previously demonstrated some interesting behavioural traits. We look at cases where the outcome of the decision is significant (i.e. response to a prolonged starvation) and transient (i.e. response to a food source). In the latter case where limited options are available, we explore a model system in which the probability of the decision is described by the Boltzmann distribution and options are represented as energy levels.

 

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Institut für Biophysik

 

 

Social Evolution of Discrimination

Gorm Jensen, Universität Bremen, AG Prof. Stefan Bornholdt


Abstract

Structural discrimination appears to be a persistent phenomenon in social systems. We here outline the hypothesis that it can result from the evolutionary dynamics of the social system itself. We study the evolutionary dynamics of agents with neutral badges in a simple social game and find that the badges are readily discriminated by the system although not being tied to the payoff matrix of the game. The sole property of being distinguishable leads to the subsequent discrimination, therefore providing a model for the emergence and freezing of social prejudice.

 

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Institut für Theoretische Physik