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Prisoner, dilemma

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https://www.readbyqxmd.com/read/29138411/divide-and-conquer-tournament-on-social-networks
#1
Jiasheng Wang, Yichao Zhang, Jihong Guan, Shuigeng Zhou
In social gaming networks, previous studies extensively investigated the influence of a variety of strategies on reciprocal behaviors in the prisoner's dilemma game. The studied frameworks range from the case that an individual uniformly cooperates or defects with all social contacts, to the recently reported divide-and-conquer games, where an individual can choose a particular move to play with each neighbor. In this paper, we investigate a divide-and-conquer tournament among 14 well-known strategies on social gaming networks...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29127336/intermediate-levels-of-network-heterogeneity-provide-the-best-evolutionary-outcomes
#2
Flávio L Pinheiro, Dominik Hartmann
Complex networks impact the diffusion of ideas and innovations, the formation of opinions, and the evolution of cooperative behavior. In this context, heterogeneous structures have been shown to generate a coordination-like dynamics that drives a population towards a monomorphic state. In contrast, homogeneous networks tend to result in a stable co-existence of multiple traits in the population. These conclusions have been reached through the analysis of networks with either very high or very low levels of degree heterogeneity...
November 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29127034/balancing-nanotoxicity-and-returns-in-health-applications-the-prisoner-s-dilemma
#3
D A Gkika, L Magafas, P Cool, J Braet
Over the past 30 years, there have been significant advancements in the field of nanomaterials. The possibility to use them in applications such as cancer treatment is extremely promising; however, the toxicity of many nanomaterials as well as the high costs associated with their use is still a concern. This paper aims to study the connection between nanomaterial toxicity and cost. This synergy may be interpreted as a different version of the classic "Prisoner's Dilemma" game, which in this case attempts to explain the possible outcomes of cooperation versus conflict between science advocating for the use of high-risk, possibly toxic materials due to their high returns, and society that might be dubious about the use of high-risk materials...
November 7, 2017: Toxicology
https://www.readbyqxmd.com/read/29126368/associations-between-cooperation-reactive-aggression-and-social-impairments-among-boys-with-autism-spectrum-disorder
#4
Miia Kaartinen, Kaija Puura, Päivi Pispa, Mika Helminen, Raili Salmelin, Erja Pelkonen, Petri Juujärvi, Esther B Kessler, David H Skuse
Cooperation is a fundamental human ability that seems to be inversely related to aggressive behaviour in typical development. However, there is no knowledge whether similar association holds for children with autism spectrum disorder. A total of 27 boys with autism spectrum disorder and their gender, age and total score intelligence matched controls were studied in order to determine associations between cooperation, reactive aggression and autism spectrum disorder-related social impairments. The participants performed a modified version of the Prisoner's Dilemma task and the Pulkkinen Aggression Machine which measure dimensions of trust, trustworthiness and self-sacrifice in predisposition to cooperate, and inhibition of reactive aggression in the absence and presence of situational cues, respectively...
November 1, 2017: Autism: the International Journal of Research and Practice
https://www.readbyqxmd.com/read/29123237/coevolution-of-vertex-weights-resolves-social-dilemma-in-spatial-networks
#5
Chen Shen, Chen Chu, Hao Guo, Lei Shi, Jiangyan Duan
In realistic social system, the role or influence of each individual varies and adaptively changes in time in the population. Inspired by this fact, we thus consider a new coevolution setup of game strategy and vertex weight on a square lattice. In detail, we model the structured population on a square lattice, on which the role or influence of each individual is depicted by vertex weight, and the prisoner's dilemma game has been applied to describe the social dilemma of pairwise interactions of players. Through numerical simulation, we conclude that our coevolution setup can promote the evolution of cooperation effectively...
November 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29121671/separating-conditional-and-unconditional-cooperation-in-a-sequential-prisoner-s-dilemma-game
#6
Raoul Bell, Laura Mieth, Axel Buchner
Most theories of social exchange distinguish between two different types of cooperation, depending on whether or not cooperation occurs conditional upon the partner's previous behaviors. Here, we used a multinomial processing tree model to distinguish between positive and negative reciprocity and cooperation bias in a sequential Prisoner's Dilemma game. In Experiments 1 and 2, the facial expressions of the partners were varied to manipulate cooperation bias. In Experiment 3, an extinction instruction was used to manipulate reciprocity...
2017: PloS One
https://www.readbyqxmd.com/read/28986381/chemotherapeutic-dose-scheduling-based-on-tumor-growth-rates-provide-a-case-for-low-dose-metronomic-high-entropy-therapies
#7
Jeffrey B West, Paul K Newton
We extended the classical tumor regression models such as Skipper's laws and the Norton-Simon hypothesis from instantaneous regression rates to the cumulative effect over repeated cycles of chemotherapy. To achieve this end, we used a stochastic Moran process model of tumor cell kinetics coupled with a prisoner's dilemma game-theoretic cell-cell interaction model to design chemotherapeutic strategies tailored to different tumor growth characteristics. Using the Shannon entropy as a novel tool to quantify the success of dosing strategies, we contrasted maximum tolerated dose (MTD) strategies as compared with low-dose, high-density metronomic strategies (LDM) for tumors with different growth rates...
October 6, 2017: Cancer Research
https://www.readbyqxmd.com/read/28957516/stags-hawks-and-doves-social-evolution-theory-and-individual-variation-in-cooperation
#8
Jeremy Van Cleve
One of the triumphs of evolutionary biology is the discovery of robust mechanisms that promote the evolution of cooperative behaviors even when cooperation reduces the fertility or survival of cooperators. These mechanisms include, kin selection, reciprocity, and direct benefits to cooperation that are often nonlinear. Though they have been extensively studied separately, investigating the joint action of these mechanisms has been more difficult. Moreover, how these mechanisms shape variation in cooperation is not well known...
September 1, 2017: Integrative and Comparative Biology
https://www.readbyqxmd.com/read/28954151/public-security-female-workers-at-the-coast-of-paran%C3%A3-brazil-intersections-of-gender-work-violence-s-and-health
#9
Daniele Schneider, Marcos Claudio Signorelli, Pedro Paulo Gomes Pereira
This study aimed to promote visibility of women working in public security along the Parana coast, articulating issues of gender, violence(s), and the health-disease process. The methodology was qualitative, through an ethnographic research which included 50 women (civilians, military policewomen, and prison officers) from municipalities along the Parana coast, between March 2014 and March 2015. Results revealed: 1) the dilemmas that these women are subjected to, facing the seasonal dynamics in the field of public security in the region; 2) exposure to violence (mainly institutional and gender-based) and its impact on these women's health; 3) power relations, marked by corporations' hierarchies and gender asymmetries between men and women in professional settings...
September 2017: Ciência & Saúde Coletiva
https://www.readbyqxmd.com/read/28931743/the-language-of-cooperation-shared-intentionality-drives-variation-in-helping-as-a-function-of-group-membership
#10
Jennifer Susan McClung, Sarah Placì, Adrian Bangerter, Fabrice Clément, Redouan Bshary
While we know that the degree to which humans are able to cooperate is unrivalled by other species, the variation humans actually display in their cooperative behaviour has yet to be fully explained. This may be because research based on experimental game-theoretical studies neglects fundamental aspects of human sociality and psychology, namely social interaction and language. Using a new optimal foraging game loosely modelled on the prisoner's dilemma, the egg hunt, we categorized players as either in-group or out-group to each other and studied their spontaneous language usage while they made interactive, potentially cooperative decisions...
September 27, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28867224/optional-interactions-and-suspicious-behaviour-facilitates-trustful-cooperation-in-prisoners-dilemma
#11
Tadeas Priklopil, Krishnendu Chatterjee, Martin Nowak
In evolutionary game theory interactions between individuals are often assumed obligatory. However, in many real-life situations, individuals can decide to opt out of an interaction depending on the information they have about the opponent. We consider a simple evolutionary game theoretic model to study such a scenario, where at each encounter between two individuals the type of the opponent (cooperator/defector) is known with some probability, and where each individual either accepts or opts out of the interaction...
September 1, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28819131/impulsiveness-does-not-prevent-cooperation-from-emerging-but-reduces-its-occurrence-an-experiment-with-zebra-finches
#12
Camille Chia, Frédérique Dubois
Reciprocal altruism, the most probable mechanism for cooperation among unrelated individuals, can be modelled as a Prisoner's Dilemma. This game predicts that cooperation should evolve whenever the players, who expect to interact repeatedly, make choices contingent to their partner's behaviour. Experimental evidence, however, indicates that reciprocity is rare among animals. One reason for this would be that animals are very impulsive compared to humans. Several studies have reported that temporal discounting (that is, strong preferences for immediate benefits) has indeed a negative impact on the occurrence of cooperation...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28806757/impact-of-interaction-style-and-degree-on-the-evolution-of-cooperation-on-barab%C3%A3-si-albert-scale-free-network
#13
Fengjie Xie, Jing Shi, Jun Lin
In this work, we study an evolutionary prisoner's dilemma game (PDG) on Barabási-Albert scale-free networks with limited player interactions, and explore the effect of interaction style and degree on cooperation. The results show that high-degree preference interaction, namely the most applicable interaction in the real world, is less beneficial for emergence of cooperation on scale-free networks than random interaction. Besides, cooperation on scale-free networks is enhanced with the increase of interaction degree regardless whether the interaction is high-degree preference or random...
2017: PloS One
https://www.readbyqxmd.com/read/28755954/duality-between-cooperation-and-defection-in-the-presence-of-tit-for-tat-in-replicator-dynamics
#14
Seung Ki Baek, Su Do Yi, Hyeong-Chai Jeong
The prisoner's dilemma describes a conflict between a pair of players, in which defection is a dominant strategy whereas cooperation is collectively optimal. The iterated version of the dilemma has been extensively studied to understand the emergence of cooperation. In the evolutionary context, the iterated prisoner's dilemma is often combined with population dynamics, in which a more successful strategy replicates itself with a higher growth rate. Here, we investigate the replicator dynamics of three representative strategies, i...
July 26, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28736534/self-organizing-complex-networks-individual-versus-global-rules
#15
Korosh Mahmoodi, Bruce J West, Paolo Grigolini
We introduce a form of Self-Organized Criticality (SOC) inspired by the new generation of evolutionary game theory, which ranges from physiology to sociology. The single individuals are the nodes of a composite network, equivalent to two interacting subnetworks, one leading to strategy choices made by the individuals under the influence of the choices of their nearest neighbors and the other measuring the Prisoner's Dilemma Game payoffs of these choices. The interaction between the two networks is established by making the imitation strength K increase or decrease according to whether the last two payoffs increase or decrease upon increasing or decreasing K...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28705924/end-of-life-chemotherapy-a-prisoner-s-dilemma
#16
EDITORIAL
Ho-Man Yeung, Randy S Hebert
No abstract text is available yet for this article.
July 13, 2017: BMJ Supportive & Palliative Care
https://www.readbyqxmd.com/read/28670295/cooperative-behavior-in-the-ultimatum-game-and-prisoner-s-dilemma-depends-on-players-contributions
#17
Amy R Bland, Jonathan P Roiser, Mitul A Mehta, Thea Schei, Barbara J Sahakian, Trevor W Robbins, Rebecca Elliott
Economic games such as the Ultimatum Game (UG) and Prisoner's Dilemma (PD) are widely used paradigms for studying fairness and cooperation. Monetary versions of these games involve two players splitting an arbitrary sum of money. In real life, however, people's propensity to engage in cooperative behavior depends on their effort and contribution; factors that are well known to affect perceptions of fairness. We therefore sought to explore the impact of relative monetary contributions by players in the UG and PD...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28659573/multilevel-evolutionary-algorithm-that-optimizes-the-structure-of-scale-free-networks-for-the-promotion-of-cooperation-in-the-prisoner-s-dilemma-game
#18
Penghui Liu, Jing Liu
Understanding the emergence of cooperation has long been a challenge across disciplines. Even if network reciprocity reflected the importance of population structure in promoting cooperation, it remains an open question how population structures can be optimized, thereby enhancing cooperation. In this paper, we attempt to apply the evolutionary algorithm (EA) to solve this highly complex problem. However, as it is hard to evaluate the fitness (cooperation level) of population structures, simply employing the canonical evolutionary algorithm (EA) may fail in optimization...
June 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28618560/topology-dependent-rationality-and-quantal-response-equilibria-in-structured-populations
#19
Sabin Roman, Markus Brede
Given that the assumption of perfect rationality is rarely met in the real world, we explore a graded notion of rationality in socioecological systems of networked actors. We parametrize an actors' rationality via their place in a social network and quantify system rationality via the average Jensen-Shannon divergence between the games Nash and logit quantal response equilibria. Previous work has argued that scale-free topologies maximize a system's overall rationality in this setup. Here we show that while, for certain games, it is true that increasing degree heterogeneity of complex networks enhances rationality, rationality-optimal configurations are not scale-free...
May 2017: Physical Review. E
https://www.readbyqxmd.com/read/28610901/neural-dynamics-of-two-players-when-using-nonverbal-cues-to-gauge-intentions-to-cooperate-during-the-prisoner-s-dilemma-game
#20
Jaehwan Jahng, Jerald D Kralik, Dong-Uk Hwang, Jaeseung Jeong
Social interaction is a fundamental part of our daily lives; however, exactly how our brains use social cues to determine whether to cooperate without being exploited remains unclear. In this study, we used an electroencephalography (EEG) hyperscanning approach to investigate the effect of face-to-face contact on the brain mechanisms underlying the decision to cooperate or defect in an iterated version of the Prisoner's Dilemma Game. Participants played the game either in face-to-face or face-blocked conditions...
June 10, 2017: NeuroImage
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