259 citations · 934 across the 34 of their papers we have counts for
26 papers · 1 filter
Annealing approximation in master-node network model
M. O. Hase, Anderson A. Ferreira, André C. R. Martins +1
This paper investigates absorbing-state phase transitions in opinion dynamics through a master-node network model analyzed using annealing approximation. We develop a theoretical f…
Memory CODA: introducing memory effects in the Continuous Opinions and Discrete Actions model
Andre C. R. Martins
The Continuous Opinions and Discrete Actions (CODA) model has been widely used to study the emergence of extremism in social networks. However, this standard model has been shown t…
Critical Exponents of Master-Node Network Model
Antonio Mihara, Anderson A. Ferreira, André C. R. Martins +1
The dynamics of competing opinions in social network play an important role in society, with many applications in diverse social contexts as consensus, elections, morality and so o…
Opinions and dark energy: A mechanism of long-range repulsion in a toy opinion particle model
André C. R. Martins
The concept of opinion particles can be introduced by studying time-continuous versions of Bayesian-inspired opinion dynamics methods. Here, we use opinion particles to further exp…
Agent mental models and Bayesian rules as a tool to create opinion dynamics models
Andre C. R. Martins
Traditional models of opinion dynamics provide a simple approach to understanding human behavior in basic social scenarios. However, when it comes to issues such as polarization an…
Extremism definitions in opinion dynamics models
André C. R. Martins
There are several opinion dynamics models where extremism is defined as part of their characteristics. However, the way extremism is implemented in each model does not correspond t…
Ideologically Motivated Biases in a Multiple Issues Opinion Model
Marcelo V. Maciel, André C. R. Martins
It has been observed people tend to have opinions that are far more internally consistent than it would be reasonable to expect. Here, we study how that observation might emerge fr…
Discrete Opinion Dynamics with M choices
Andre C. R. Martins
Here, I study how to obtain an opinion dynamics model for the case where there are possible discrete choices and there is need to model how strong each agent choice is. The new…
Network generation and evolution based on spatial and opinion dynamics components
André C. R. Martins
In this paper, a model for a spatial network evolution based on a Metropolis simulation is presented. The model uses an energy function that depends both on the distance between th…
Thou shalt not take sides: Cognition, Logic and the need for changing how we believe
André C. R. Martins
We believe, in the sense of supporting ideas and considering them correct while dismissing doubts about them. We take sides about ideas and theories as if that was the right thing…
Trust in the CODA model: Opinion Dynamics and the reliability of other agents
André C. R. Martins
A model for the joint evolution of opinions and how much the agents trust each other is presented. The model is built using the framework of the Continuous Opinions and Discrete Ac…
The building up of individual inflexibility in opinion dynamics
André C. R. Martins, Serge Galam
Two models of opinion dynamics are entangled in order to build a more realistic model of inflexibility. The first one is the Galam Unifying Frame (GUF), which incorporates rational…
Modelling Epistemic Systems
Andre C. R. Martins
In this Chapter, I will explore the use of modeling in order to understand how Science works. I will discuss the modeling of scientific communities, providing a general, non-compre…
Discrete Opinion models as a limit case of the CODA model
André C. R. Martins
Opinion Dynamics models can be, for most of them, divided between discrete and continuous. They are used in different circumstances and the relationship between them is not clear.…
Artifacts of opinion dynamics at one dimension
Serge Galam, Andre C. R. Martins
The dynamics of a one dimensional Ising spin system is investigated using three families of local update rules, the Galam majority rules, Glauber inflow influences and Sznadj outfl…
A middle option for choices in the Continuous Opinions and Discrete Actions model
Andre C. R. Martins
Modeling the conditions for the emergence of extremism is a very important problem, with clear applications for describing the interaction among individuals. Traditional models eit…
Social Effects in Science: Modelling Agents for a Better Scientific Practice
Andre C. R. Martins
Science is a fundamental human activity and we trust its results because it has several error-correcting mechanisms. Its is subject to experimental tests that are replicated by ind…
The Importance of Disagreeing: Contrarians and Extremism in the CODA model
André C. R. Martins, Cleber D. Kuba
In this paper, we study the effects of introducing contrarians in a model of Opinion Dynamics where the agents have internal continuous opinions, but exchange information only abou…
Opinion Dynamics of Learning Agents: Does Seeking Consensus Lead to Disagreement?
Renato Vicente, Andre C. R. Martins, Nestor Caticha
We study opinion dynamics in a population of interacting adaptive agents voting on a set of complex multidimensional issues. We consider agents which can classify issues into for o…
A Bayesian Framework for Opinion Updates
Andre C. R. Martins
Opinion Dynamics lacks a theoretical basis. In this article, I propose to use a decision-theoretic framework, based on the updating of subjective probabilities, as that basis. We w…
An Opinion Dynamics Model for the Diffusion of Innovations
Andre C. R. Martins, Carlos de B. Pereira, Renato Vicente
We study the dynamics of the adoption of new products by agents with continuous opinions and discrete actions (CODA). The model is such that the refusal in adopting a new idea or p…
Bayesian Updating Rules in Continuous Opinion Dynamics Models
Andre C. R. Martins
In this article, I investigate the use of Bayesian updating rules applied to modeling social agents in the case of continuos opinions models. Given another agent statement about th…
Mobility and Social Network Effects on Extremist Opinions
André C. R. Martins
Understanding the emergence of extreme opinions and in what kind of environment they might become less extreme is a central theme in our modern globalized society. A model combinin…
Continuous Opinions and Discrete Actions in Opinion Dynamics Problems
Andre C. R. Martins
A model where agents show discrete behavior regarding their actions, but have continuous opinions that are updated by interacting with other agents is presented. This new updating…