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Introducing Robofish: Leading the crowd in studying group dynamics
Date:6/28/2010

ld tempt other fish to leave the tank's refuge area and convince its companions to make a 90 degree turn.

Single fish left the refuge much sooner if Robofish instigated the move than they would on their own, though groups of fish left quite quickly without other motivation. Robofish was able to persuade both single fish and groups to make a turn. However, the longer time the fish spent in the tank, the less likely they were to display shoaling activity either on their own or in response to Robofish.

"Because Robofish moved faster and without stopping and tended to be at the front or on the edge of the shoal, the other fish saw it as bold and definite in its actions, which encouraged them to follow," said Jolyon. "The fish were more easily influenced by a bolder member when they were nervous in new surroundings. Once they'd got used to the tank, they moved round quite happily to explore the tank, rather than moving in unison as they did at the start."

The experiments funded through the Biotechnology and Biological Sciences Research Council and the Engineering and Physical Sciences Research Council have also allowed the researchers to answer a long-standing question of group dynamics: whether an individual's ability to influence a group is dependent on how close together its members are. In fact, when Robofish turned, its nearest neighbour did turn first, but it made no difference whether they were 9cm or 33cm away from the robot. Most models of group dynamics are based on the assumption that the closer you are to your neighbour the more influence you have, but this study has added weight to the argument that relative, rather than metric distance, is more important.


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Contact: Jo Kelly
jokelly@campuspr.co.uk
44-113-258-9880
University of Leeds
Source:Eurekalert  

Page: 1 2

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