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From: | Jim Anderson |
Subject: | [Swarmfest2007] swarmfest submission for lemasson |
Date: | Mon, 11 Jun 2007 11:17:40 -0700 |
Dear Steve and SwarmFest committee I am submitting this talk for Bertrand Lemasson. I will act as his contact information since he is currently
traveling and will assume a post doc position with my group starting July. Best Regards Also, the DePaul registration site is having problems so I
have not been able to register him or reserve housing. Jim Anderson 206-543-4772 -------------------------------------------------------------------------------------------------------------------------------- Bertrand Lemasson Intermediate
scales of organization in collective behavior: the role of local neighborhoods
and information dispersion on emergent group dynamics Abstract Schooling
behavior in fish is a self-organized process that has been shown to result in
rapid communication among its constituents. This adaptive behavior contributes
to individual fitness in terms of foraging
success, migration patterns, mating, and reducing
predation risk. Simple behavioral algorithms have been
demonstrated to successfully replicate the traffic
rules that can generate the degree of cohesion and synchrony observed in small
to moderately sized groups. In this study, we use a particle model to
investigate how
information is disseminated within a group to determine if information can be
accurately transmitted across
groups regardless of whether it originates internally, or externally. Internal
stimulations are done by assigning
information on a preferred heading to a random proportion of the group. An
external stimulus is mimicked
by assigning informants to either the leading or trailing edge of the group.
Individuals within a group
are assumed to balance their social tendencies with any information they may be
given, and individual movement
decisions are determined based on the average heading observed within a subject’s
local neighborhood. We first corroborate recent findings that only a small
proportion of informed individuals are required in
order to influence the directional decisions of
a group. We then demonstrate that such accurate propagation of
information across a group using a simple
averaging rule requires that the informants be uniformly distributed
throughout the group. The accuracy of
directional propagation of information across a group from front to
back is higher for relatively small groups (10
or 10 individuals), but reduced in groups of 50. Accuracy is
reduced in all group sizes tested if the
information originates at the rear of the group. Our results indicate
that new traffic
rules are necessary in order to explain the rapid communication dynamics
observed in natural fish
schools under threat. |
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