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19 December, 2012 in General, Images, People, Videos | Tags: aggregation, biology, Clustering, Collective Intelligence, collective phenomena, Complex Systems, Photography, Positive feedback, Self-Organization, Self-Regulation, Social Behaviour, Social cognition, Social Foraging, Swarm Coordination, Swarm Intelligence, Swarms | 1 comment
During several years, Octavio Aburto thought of one photo. Now, he finally got it. The recently published photograph by Aburto, titled “David and Goliath” (it his in fact David Castro, one of his research science colleagues at the center of this stunning image) has been widely shared over the last few weeks. It was taken at Cabo Pulmo National Park (Mexico) and submitted to the National Geographic photo contest 2012. Here, he captures the sheer size of fish aggregations in perspective with a single human surrounded by abundant marine life. On a recent interview, he explains:
[…] … this “David and Goliath” image is speaking to the courtship behavior of one particular species of Jack fish. […] Many people say that a single image is worth a thousand words, but a single image can also represent thousands of data points and countless statistical analyses. One image, or a small series of images can tell a complicated story in a very simple way. […] The picture you see was taken November 1st, 2012. But this picture has been in my mind for three years — I have been trying to capture this image ever since I saw the behavior of these fish and witnessed the incredible tornado that they form during courtship. So, I guess you could say this image took almost three years. […], in mission-blue.org , Dec. 2012.
Video – Behind the scenes of David and Goliath image. This photo was taken at Cabo Pulmo National Park and submitted to the National Geographic photo contest 2012. You can see more of his images from this place and about Mexican seas on Octavio‘s web link.
8 June, 2009 in General, Papers, People, Research, Videos, VR papers | Tags: aggregation, Amplification, Autocatalysis, Autocatalytic systems, behavioral rules, Bodhisattva, Christine Rabette, Clustering, Collective Intelligence, Collective Perception, Complex Systems, pheromone, Positive feedback, Self-enhancement, Self-Organization, snowballing effect, Social cognition, Stigmergy, Viral, yawn of laughter | Leave a comment
Video – Merci! (referred also as Bodhisattva in metro), short film by Belgian director Christine Rabette awarded in 2003 with a Golden Wave for best Short Film (Court-Métrage), now climbing to more than a half-million views on YouTube. Along with yawning and the flu, few things are as contagious and viral as laughter. After all, we are humans not androids, for god’s sake!
[…] In contrast to negative feedback, positive feedback (f+) generally promotes changes in the system (the majority of SO systems use them). The explosive growth of the human population provides a familiar example of the effect of positive feedback. The snowballing autocatalytic effect of f+ takes an initial change in a system (due to amplification of fluctuations; a minimal and natural local cluster of objects could be a starting point) and reinforces that change in the same direction as the initial deviation. Self-enhancement, amplification, facilitation, and autocatalysis are all terms used to describe positive feedback . Another example could be provided by the clustering or aggregation of individuals. Many birds, such as seagulls nest in large colonies. Group nesting evidently provides individuals with certain benefits, such as better detection of predators or greater ease in finding food. The mechanism in this case is imitation2: birds preparing to nest are attracted to sites where other birds are already nesting, while the behavioral rule could be synthesized as “I nest close where you nest”. The key point is that aggregation of nesting birds at a particular site is not purely a consequence of each bird being attracted to the site per se. Rather, the aggregation evidently arises primarily because each bird is attracted to others (check for further references on [7,9]). On social insect societies, f+ could be illustrated by the pheromone reinforcement on trails, allowing the entire colony to exploit some past and present solutions. Generally, as in the above cases, positive feedback is imposed implicitly on the system and locally by each one of the constituent units. Fireflies flashing in synchrony  follow the rule, “I signal when you signal”, fish traveling in schools abide by the rule, “I go where you go”, and so forth. In humans, the “infectious” quality of a yawn of laughter is a familiar example of positive feedback of the form, “I do what you do”. Seeing a person yawning3, or even just thinking of yawning, can trigger a yawn . There is however one associated risk, generally if f+ acts alone without the presence of negative feedbacks, which per si can play a critical role keeping under control this snowballing effect, providing inhibition to offset the amplification and helping to shape it into a particular pattern. Indeed, the amplifying nature of f+ means that it has the potential to produce destructive explosions or implosions in any process where it plays a role. Thus the behavioral rule may be more complicated than initially suggested, possessing both an autocatalytic as well as an antagonistic aspect. In the case of fish , the minimal behavioral rule could be “I nest where others nest, unless the area is overcrowded”. In this case both the positive and negative feedback may be coded into the behavioral rules of the fish. Finally, in other cases one finds that the inhibition arises automatically, often simply from physical constraints. […], in, Social Cognitive Maps, Swarm Collective Perception and Distributed Search on Dynamic Landscapes.