Oxytocin is required for lactation by promoting milk expulsion. Oxytocin has also been reported to exert a positive role in social attachment. The postpartum period has been shown to be crucial for maternal behavior initiation, and required self-trust reinforcement. However, this period is also remarkable for the high risk exposure of either psychic or… (More)
In this paper, we present an approach to designing decentralized robot control policies that mimic certain microscopic and macroscopic behaviors of ants performing collective transport tasks. In prior work, we used a stochastic hybrid system model to characterize the observed team dynamics of ant group retrieval of a rigid load. We have also used… (More)
Collective food transport in ant colonies is a striking, albeit poorly understood, example of coordinated group behavior in nature that can serve as a template for robust, decentralized multi-robot cooperative manipulation strategies. We investigate this behavior in Aphaenogaster cockerelli ants in order to derive a model of the ants' roles and behavioral… (More)
Food sharing is vital for a large number of species, either solitary or social, and is of particular importance within highly integrated societies, such as in colonial organisms and in social insects. Nevertheless, the mechanisms that govern the distribution of food inside a complex organizational system remain unknown. Using scintigraphy, a method… (More)
The organization of complex societies requires constant information flow between individuals. The shape of the food web organizes itself according to the spatial distribution of the individuals and of the stocks. To understand how the spatial organization of the food stocks changes with the colony needs, we monitored the flow of radiolabeled sugar solution… (More)
While most ant species carry burdens solitarily, a few have evolved impressive skills at cooperative transport that are important to their ecological success. We examined one of these species, Novomessor cockerelli, with the goals of better understanding how transport groups are coordinated and how cooperation influences the efficiency of load transport.… (More)
The sunk-cost effect as an optimal rate-maximizing behavior .
A stochastic hybrid system model of collective transport in the desert ant Aphaenogaster cockerelli. The sunk-cost effect as an optimal rate-maximizing behavior.