12. Study of Social Foraging Situations Using a 3D Multiplayer Videogame
Laurent Avila-Chauvet-Technological Institute of Sonora, Diana Mejía Cruz-Technological Institute of Sonora
In social foraging situations, it has been observed that some members of the group tend to search their own food sources or release the conditions to access food sources (Producers), while others tend to join previously discovered food sources (Scroungers). The Producer-Scrounger Game describes the optimal proportion of producers and scroungers within a group. We developed a 3D Multiplayer Videogame that simulated 1) the properties of a habitat (Patch and transition zones) and 2) the components of a foraging episode (search, choice, identification, consumption, and manipulation). During the task, participants explored and exploited the virtual habitat by moving an agent with a joystick. We tested four conditions that varied in the quantity and probability of food units within the patch zones. In addition, each of the participants was exposed to different risk and impulsivity tests (BART, IGT, Delay Discounting). The results show that participants tended to produce more when the probability of find resources was greater. Concerning impulsivity tests, we observed a positive correlation between BART risk-taking behavior and the proportion of scrounger responses. The AUC of the Delay Discounting task was positively correlated with the number of food units obtained by the participants. The relationship between individual characteristics and the execution of scrounger responses in the developed video game is discussed
13. Evidence of social inference in rats
Lin Peng-Kanazawa University, Tohru Taniuchi-Kanazawa University
The present study examined social inference ability in rats. First, rats were trained on three daily trials to learn the type of food sites. On the first trial, rats were allowed to eat at four food sites in an experimental field. On the second and third trials, two food sites were replenished with foods (replenished sites) but the other two sites were not (depleted sites). All rats learned the type of the food sites and came to visit the replenished sites earlier than the depleted sites on the second and third trials. In the test conducted after the training, another demonstrator, i.e., another rat or another mouse, was shown to the subjects to give premise information in a social inference situation. That is, the demonstrator, a rat or a mouse, visited one of the two sites of either site type first, and then a subject rat was given a choice between the two sites of the same site type; the site the demonstrator visited and the unvisited one. When other rats served as the demonstrator, rats did not show any sign of social inference; they had a tendency to follow the demonstrator regardless of the type of the food sites. In contrast, subject rats had a significant tendency to avoid the depleted site visited by a mouse demonstrator and such a tendency was not observed for the replenished sites. These results suggest rats can make some kind of social inference by combining information about behavior of other animals and type of food sites.