Thomas Bassanetti’s research while affiliated with Université Toulouse III - Paul Sabatier and other places

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Publications (2)

Cooperation and deception through stigmergic interactions in human groups
  • Article

October 2023

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57 Reads

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1 Citation

Proceedings of the National Academy of Sciences

Thomas Bassanetti

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Stigmergy is a generic coordination mechanism widely used by animal societies, in which traces left by individuals in a medium guide and stimulate their subsequent actions. In humans, new forms of stigmergic processes have emerged through the development of online services that extensively use the digital traces left by their users. Here, we combine interactive experiments with faithful data-based modeling to investigate how groups of individuals exploit a simple rating system and the resulting traces in an information search task in competitive or noncompetitive conditions. We find that stigmergic interactions can help groups to collectively find the cells with the highest values in a table of hidden numbers. We show that individuals can be classified into three behavioral profiles that differ in their degree of cooperation. Moreover, the competitive situation prompts individuals to give deceptive ratings and reinforces the weight of private information versus social information in their decisions.

Fig. 3: Quantification of individual behaviors for visiting cells. For the noncompetitive Rule 1 (blue) and the competitive Rule 2 (orange), symbols correspond to the experimental results, while solid lines are the predictions of the model. (A) Probability to find the best cell, of value 99. (B ) Probability to find one of the four cells whose values are 86 (× 2), 85, or 84. (C ) Probability to find one of the four cells whose values are 72 (× 2) or 71 (× 2). The black dashed and dotted lines correspond to the expected probabilities of two different visiting strategies: i) cells chosen randomly (full random search, dashed lines), and ii) cells chosen randomly among those that have not been already visited (sequential random search, dotted lines). (D-F ) V 1 (t), V 2 (t), V 3 (t) are respectively the value of the first-best cell, second-best cell, and third-best cell visited by the participants, as a function of the round t. (G-I ) Probability B 1 (t), B 2 (t), B 3 (t) to revisit the first-best cell, the second-best cell, and the third-best cell of the previous round, as a function of the round t > 1.
Cooperation and deception through stigmergic interactions in human groups
  • Preprint
  • File available

April 2023

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94 Reads

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1 Citation

Thomas Bassanetti

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[...]

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Stigmergy is a generic coordination mechanism widely used by animal societies, in which traces left by individuals in a medium guide and stimulate their subsequent actions. In humans, new forms of stigmergic processes have emerged through the development of online services that extensively use the digital traces left by their users. Here we combine interactive experiments with faithful data-based modeling to investigate how groups of individuals exploit a simple rating system and the resulting traces in an information search task in competitive or non-competitive conditions. We find that stigmergic interactions can help groups to collectively find the cells with the highest values in a table of hidden numbers. We show that individuals can be classified into three behavioral profiles that differ in their degree of cooperation. Moreover, the competitive situation prompts individuals to give deceptive ratings and reinforces the weight of private information versus social information in their decisions.

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